My take is: The Return of Jesus was immanent from the time of The Resurrection to me, this is why St Paul writes about it as in his time, later he corrects it to the time of The Return is unknown. We are to experience many things that will shake us up before the actual Return of Jesus. If we look at history many times indeed have we been absolutely shaken up and events that do shake us up continues today.
We do not know when Jesus will return, only that He will. The end times as they are called are perhaps not so much indicated by wars and natural disasters as a horrific trial that The Church will endure “follow her Lord in His death and resurrection” (see below). The Ultimate Trial of The Church. We do not know how long this trial will last, but we do know that the “messianic hope, which can only be realized beyond history through the eschatological judgement” (see 676 below from the Catholic Catechism).
Before Jesus does return, this is what The Church tells us:
The Church’s ultimate trial
675 Before Christ’s second coming the Church must pass through a final trial that will shake the faith of many believers.574 The persecution that accompanies her pilgrimage on earth575 will unveil the “mystery of iniquity” in the form of a religious deception offering men an apparent solution to their problems at the price of apostasy from the truth. The supreme religious deception is that of the Antichrist, a pseudo-messianism by which man glorifies himself in place of God and of his Messiah come in the flesh.576
676 The Antichrist’s deception already begins to take shape in the world every time the claim is made to realize within history that messianic hope which can only be realized beyond history through the eschatological judgment. The Church has rejected even modified forms of this falsification of the kingdom to come under the name of millenarianism,577 especially the “intrinsically perverse” political form of a secular messianism.578
677 The Church will enter the glory of the kingdom only through this final Passover, when she will follow her Lord in his death and Resurrection.579 The kingdom will be fulfilled, then, not by a historic triumph of the Church through a progressive ascendancy, but only by God’s victory over the final unleashing of evil, which will cause his Bride to come down from heaven.580 God’s triumph over the revolt of evil will take the form of the Last Judgment