I'm fairly certain that he's never going to get convicted. I believe he's "protected" in the exact same way that the Clintons have been protected. But on the other hand, I could be wrong on that one because every once in a while the PTSB will 'sacrifice' certain politicians who they no longer have use for. So what ends up happening with Trump remains to be seen.
Also, this may be a Captain Obvious thing to say, but a conviction or lack thereof isn't what determines someone's actual guilt or innocence. Al Capone was only ever convicted of tax evasion.
And again, Mr. Slick Clinton wasn't convicted of crimes but he's one of the most corrupt individuals to ever set foot in the Oval Office.