Regarding the second coming of the Lord, we won't know the exact day or hour when he shall come.
...Matthew 24 is a main chapter which speaks of the second coming of our Lord.
But we do know it came and went already and YOU have been left behind!
Mt 24:3 And as he sat upon the mount of Olives, the disciples came unto him privately, saying, Tell us, when shall these things be? and
what shall be the sign of thy coming, and of the end of the world? ...
Mt 24:34 Verily I say unto you,
This generation shall not pass, till all these things be fulfilled.
MAR 13:30 Verily I say unto you, that
this generation shall not pass, till all these things be done.
LUK 21:32 Verily I say unto you,
This generation shall not pass away, till all be fulfilled.
You would think that everyone in the generation when Christ was on the earth has passed away. But that is simply not the case.
John 21:22-23
22 Jesus saith unto him, If I will that he tarry till I come, what is that to thee? follow thou me.
23 Then went this saying abroad among the brethren, that that disciple should not die: yet Jesus said not unto him, He shall not die; but, If I will that he tarry till I come, what is that to thee?
The Apostle John was given the blessing that he should tarry till Jesus comes.
Not quite! John dies AD98.
Here are the verses you left out before the part you misquoted as being about John, you do know that it was not the apostle John who betrayed Jesus;
20 Then Peter, turning about, seeth the disciple whom Jesus loved following; which also leaned on his breast at supper, and said, Lord,
which is he that betrayeth thee?
21
Peter seeing him saith to Jesus, Lord, and what shall this man do?
22 Jesus saith unto him,
If I will that he tarry till I come, what is that to thee? follow thou me.
23 Then went this saying abroad among the brethren, that that disciple should not die: yet Jesus said not unto him, He shall not die; but, If I will that he tarry till I come, what is that to thee?
The incident spoken of in the verses you quoted are found in John 13:
John 13:21-27
21 When Jesus had thus said, he was troubled in spirit, and testified, and said, Verily, verily, I say unto you, that one of you shall betray me.
22 Then the disciples looked one on another, doubting of whom he spake.
23 Now there was leaning on Jesus’ bosom one of his disciples, whom Jesus loved.
24 Simon Peter therefore beckoned to him, that he should ask who it should be of whom he spake.
25 He then lying on Jesus’ breast saith unto him, Lord, who is it?
26 Jesus answered, He it is, to whom I shall give a sop, when I have dipped it. And when he had dipped the sop, he gave it to Judas Iscariot, the son of Simon.
27 And after the sop Satan entered into him. Then said Jesus unto him, That thou doest, do quickly.
It was not Peter who was leaning on Jesus' bossom because according to verse 24 above, Peter beckoned to the one leaning on Jesus' bossom to ask Jesus who it is that will betray him. Jesus tell the one who is leaning on his bossom that he will dip a sop and the one he gives it to will be the one who betray's him. He gave the dipped sop to Judas Iscariot. Judas was not the one who was leaning on Jesus' breast. Who was the disciple leaning on Jesus' breast? It was none other than John the Apostle.
John often spoke of himself in his own gospel as the disciple whom Jesus loved. Here is an example:
John 21:1-7
1 After these things Jesus shewed himself again to the disciples at the sea of Tiberias; and on this wise shewed he himself.
2 There were together Simon Peter, and Thomas called Didymus, and Nathanael of Cana in Galilee, and the sons of Zebedee, and two other of his disciples.
(as a note, the sons of Zebedee are James and John)
3 Simon Peter saith unto them, I go a fishing. They say unto him, We also go with thee. They went forth, and entered into a ship immediately; and that night they caught nothing.
4 But when the morning was now come, Jesus stood on the shore: but the disciples knew not that it was Jesus.
5 Then Jesus saith unto them, Children, have ye any meat? They answered him, No.
6 And he said unto them, Cast the net on the right side of the ship, and ye shall find. They cast therefore, and now they were not able to draw it for the multitude of fishes.
7 Therefore that disciple whom Jesus loved saith unto Peter, It is the Lord. Now when Simon Peter heard that it was the Lord, he girt his fisher’s coat unto him, (for he was naked,) and did cast himself into the sea.
Judas was not among these group of disciples. Yet John speaks of the disciple whom Jesus loved. It certainly wasn't Judas whom he spake of. It was John himself.
John did not die in 98 AD. That is speculation.
Here is another example of John referring to himself as the disciple whom Jesus loved:
John 20:1-10
1 The first day of the week cometh Mary Magdalene early, when it was yet dark, unto the sepulchre, and seeth the stone taken away from the sepulchre.
2 Then she runneth, and cometh to Simon Peter, and to the other disciple, whom Jesus loved, and saith unto them, They have taken away the Lord out of the sepulchre, and we know not where they have laid him.
3 Peter therefore went forth, and that other disciple, and came to the sepulchre.
4 So they ran both together: and the other disciple did outrun Peter, and came first to the sepulchre.
5 And he stooping down, and looking in, saw the linen clothes lying; yet went he not in.
6 Then cometh Simon Peter following him, and went into the sepulchre, and seeth the linen clothes lie,
7 And the napkin, that was about his head, not lying with the linen clothes, but wrapped together in a place by itself.
8 Then went in also that other disciple, which came first to the sepulchre, and he saw, and believed.
9 For as yet they knew not the scripture, that he must rise again from the dead.
10 Then the disciples went away again unto their own home.
It certainly wasn't Judas who ran with Peter to the sepulchre.