The kingdom is already here. The New Testament is quite clear about that.Then God's Spirit, The Holy Spirit will be poured out upon The Jews, and The Millennial Kingdom of Christ will begin. The Son of David and The Son of Man takes His throne in Jerusalem, not for The Jew, but to be The King for all Men as The Prince of Peace.
In the first century, the disciples began to recognize their place in God’s kingdom on earth. Paul proclaimed citizenship in the kingdom for himself and his contemporaries (Col 1:13). The letter to the Hebrews exhorts believers to be grateful for the kingdom they had received (Heb 12:28). And the Revelator declared himself a partner in the kingdom with his brethren (Rv 1:9). The kingdom’s arrival is clearly a first-century phenomenon.