In the book Fundamentals of Catholic Dogma, in the section on the second coming of Christ, are listed the signs on the Second Coming. Almost everything can be said to have already transpired, except the Conversion of the Jєωs.
1. The preaching of the Gospel to the entire world can be said to have already happened. Not only that, nowadays, people now have access to a machine translated 1917 Catholic Encyclopedia in their pockets, all around the world.
2. The falling away from the Faith can be said to have already happened. We have lived the cultural revolutions of the 1960's, many thousands of Priests and Religious left the Priesthood and the Religious life, in droves. I don't think most traditional have a problem with understanding there has been a falling away.
3. The appearance of the Antichrist can be said to have already happened, with the LaSallette secret alone.
4. We have had severe tribulations, hurricanes, tsunamis, bitter persecutions, the most bitter kind, with atheistic socialism and more.
5. The conversion of the Jєωs. There are 5 signs listed in this book as signs of the second coming. The one that can not really be said to have happened, is the conversion of the Jєωs.