You just make things up out of thin air. He did not tell them that the kingdom was on its way shortly. Instead, we see that the Apostles were with the Lord Jesus for forty days while He tutored them on the things concerning the kingdom. Then after learning about the kingdom from the King Himself they knew that the kingdom would be restored to Israel only they didn't know when it would happen:
"When they therefore were come together, they asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel?" (Acts 1:6).
if they were wrong for thinking that the kingdom was going to be restored to Israel He would have corrected them, especially since He was about to send them out to preach the "gospel of the kingdom." But he did no such thing but only told them that they were not to know when it would happen:
"And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power" (Acts 1:7).
If the kingdom was never going to be restored to Israel then it would make absolutely no sense for the Lord Jesus to say anything about its timing.
But of course you think that you know more about the kingdom than did the Apostles themselves. And if you would have been there you probably would have corrected the Lord for saying anything at all about the time when it was going to happen.