God apparently notices Sun-Man doing good on earth and decides to send Jesus back to “learn” from the superman.
Yes, Revelation is absolutely written in chronological order of events. The Church Age, the Rapture of the Church, the time of Jacob’s trouble, Armageddon, the Thousand Year Reign of King Jesus, Gog and Magog, judgement, new heaven and new earth, eternity.
Are all men now saved since Jesus died for them? No, God never took away the privilege of choice. Each man still has to make his own decision. He has to accept Jesus as his personal Savior.