I forgot about something, when Jesus returns he would still be with his glorious body. It's not a body like yours or mine. So that would also be sign I would be looking for.
How "glorious" are we talking? 8/10? Maybe 9? Certainly not 10/10, right?
It appears his glorious body is a body of flesh and blood. But it seems to be able to do some really really cool parlor tricks. Teleportation being one of the biggest ones.
I am not sure if it is technically teleportation or time manipulation. Freeze everyone walk out of the room and resume time that would match the description but either way he could appear and disappear at will.
You would think with this power he would have visited the native americans and africans of his day and explained who he was and why he was bothering them.