"Keep on the watch, therefore, because you do not know on what day your Lord is coming." (Matthew 24:42)
"But know one thing: If the householder had known in what watch the thief was coming, he would have kept awake and not allowed his house to be broken into. On this account, you too prove yourselves ready, because the Son of man is coming at an hour that you do not think to be it." (Matthew 24:43-44)
"You also, keep ready, because at an hour that you do not think likely, the Son of man is coming." (Luke 12:40)
"And then they will see the Son of man coming in the clouds with great power and glory." (Mark 13:26)
"And then they will see the Son of man coming in a cloud with power and great glory." (Luke 21:27)
When the Christians fled Jerusalem in the first century, they didn't "see the Son of man coming in a cloud with power and great glory." They saw the Roman armies coming with power and glory for men.
"But as these things start to occur, stand up straight and lift up your heads, because your deliverance is getting near." (Luke 21:27,28)
When the Christians fled Jerusalem in the first century, they didn't have "deliverance". They were fleeing. Fleeing isn't "deliverance".
When Jesus visibly comes to the rescue at the end of the great tribulation, that will be deliverance.