Among amillennialists the traditional view holds that verse 27 speaks of the end of time while verse 28 speaks of the establishment of the kingdom on Pentecost. In Matthew 13 he spoke of the end of the age when the righteous would shine like the stars. The wicked would be condemned at that time also. Revelation, no less than five times tells us the events under view are imminent. Matthew speaks of the coming of Jesus to judge every man.
Revelation does also.
Matthew says Jesus would come in that generation. Revelation says he was coming quickly. What we see then is a pattern of consistency. And this is always set in a time-frame of imminency. Thus, if Jesus came in his glory, he came in his kingdom.