Eschatology is the study of the “end times.” There are many opinions about the end times. For myself, I think the world entered the end times with the Incarnation of Jesus. At that time a new reality of human history began and everything that has happened since and will happen until history is long past is founded on that event.
If my thinking about the end times is right, the whole Christian period on earth is part of the end times and all that is in Scripture concerning this period may apply to us or to Christians who have come before us, and after us. The four gospels and the Book of Acts tell us the history of the beginnings of Christianity. The book of Revelation tells us the rest of the story. It is a very complex book because that is the way history is. Another difficulty is that we cannot know where we are on the time-line if there is one. A third problem arises from the fact that John had to describe spiritual entities in terms of physical images.
All in all, I believe the end times we live in are complex mixture of physical and spiritual events of which most occur outside the realm of our human understanding unless their meaning is revealed to us by God.