On Shavuot (Pentecost), the first Believers, who were nearly all Jewish, recognized that the New Covenant had begun, but they didn’t immediately recognize that non-Jews should be part of God’s people or His New Covenant blessings.
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.
The Acts of the Apostles does not contain all the acts of all the apostles. It would be more accurate to call it “some of the acts of some of the apostles.” Acts mostly records the work of only two of the apostles – Peter and Paul. Peter’s labors for the Lord are recorded in chapters 2 – 12. Paul’s work in the kingdom is recorded in chapters 13-28. Peter worked mainly among the Jews. He carried the Gospel to Jerusalem, Judea, and Samaria. Paul preached among the Gentiles and carried the Gospel to Rome and later to Spain (Acts 1:8; Romans 15:24, 28). While Peter and Paul were busy with their work, the other apostles were carrying the Gospel to other parts of the world.