Most prophecy has been fulfilled. The book of revelation has lots of stuff in it that people claim to understand, they even have charts graphs and huge boards of stuff that they preach as the true meaning. I'm sorry, but if you think you got it all figured out you don't know a dang thing, if you claim to only know Christ and him crucified, then you probably have exactly what you need to know figured out. I don't even read revelation cause I don't care how it all comes to pass. I just keep on keeping on and do my best to live like a good person and repent for when I fumble the ball. I do a lot of that. I'm a turd.
Revelation came very close to not making it into NT canon and was not part of the NT teaching for a long time. Even now most really can't decipher the majority of its meaning with any certainty.
IIRC - and y'all ain't important enough for me to double check - John pretty much starts off by saying that readers of his letter will receive a "blessing". The purpose of his writing was to reveal Jesus as the "Son of God", aka "God incarnate", and to claim that He was still alive in another dimension which is commonly called Heaven and still in charge of all there is.
THAT knowledge is the "blessing", and the purpose of the book. All the end times imagery was probably intended for John's eyes only and he made a hell of a mess trying to translate it in detail.
