There are different layers of meaning.
There was a historical sense.
This is where Jesus is warning His followers who are about to experience the destruction of the Temple and “Covenant Judgment”.
Covenant judgment is sometimes described in the Old Testament as a coming of the Lord.
There was a personal sense too (to me and to you).
Someday I will die bodily. That will be my PERSONAL coming of the Lord.
There was an end-times sense or “Eschatological sense” too.
This will be pertinent to the times at the end of the world.
(There is even a personal morality sense. There is consequences for sin and in a positive sense, for good works done in grace too)
So WHICH sense do I affirm?
All of them.
Hope this helps and welcome to Catholic Answers Forums!
PS See CCC 113-118
From LUKE chapter 21
The Destruction of Jerusalem Foretold
20 “But when you see Jerusalem surrounded by armies, then know that its desolation has come near. 21 Then let those who are in Judea flee to the mountains, and let those who are inside the city depart, and let not those who are out in the country enter it; 22 for these are days of vengeance, to fulfil all that is written. 23 Alas for those who are with child and for those who give suck in those days! For great distress shall be upon the earth and wrath upon this people; 24 they will fall by the edge of the sword, and be led captive among all nations; and Jerusalem will be trodden down by the Gentiles, until the times of the Gentiles[a] are fulfilled.
The Coming of the Son of Man
25 “And there will be signs in sun and moon and stars, and upon the earth distress of nations in perplexity at the roaring of the sea and the waves, 26 men fainting with fear and with foreboding of what is coming on the world; for the powers of the heavens will be shaken. 27 And then they will see the Son of man coming in a cloud with power and great glory. 28 Now when these things begin to take place, look up and raise your heads, because your redemption is drawing near.”
The Lesson of the Fig Tree
29 And he told them a parable: “Look at the fig tree, and all the trees; 30 as soon as they come out in leaf, you see for yourselves and know that the summer is already near. 31 So also, when you see these things taking place, you know that the kingdom of God is near. 32 Truly, I say to you, this generation will not pass away till all has taken place. 33 Heaven and earth will pass away, but my words will not pass away.
Exhortation to Watch
34 “But take heed to yourselves lest your hearts be weighed down with dissipation and drunkenness and cares of this life, and that day come upon you suddenly like a snare; 35 for it will come upon all who dwell upon the face of the whole earth. 36 But watch at all times, praying that you may have strength to escape all these things that will take place, and to stand before the Son of man.” . . .