The focus here (v.1) is in heaven. Salvation is from the Lord God not the usurper. God has judged the great whore, the “old woman of prophecy,” and avenged the murder of the true believers (v.2). These are the enemies of God, but what do the Scriptures tell us about the timing of these events?
The LORD said to My Lord, Sit You on My right hand, till I make Your enemies Your footstool? (Matthew 22:44. Also Psalms 110:1)
Christ must remain on the right hand of the Father, until all His enemies, including the great whore, are judged or put under His feet (or made His footstool). Christ cannot bodily return in His Second Coming to Earth until all His enemies are piled up and He rests His feet upon them.
There is no secret rapture before Christ’s Second Coming. He resurrects all believers, both living and dead, at His Return, and all are judged then, and not before He has destroyed all His enemies.
And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory. 31 And He shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other. (Matthew 24:30,31)
It will be very well known. It will be noisy. All will see it happen. It will be global.
Behold, He comes with clouds; and every eye shall see Him, and they also which pierced Him: and all kindreds of the earth shall wail because of Him. Even so, Amen. (Revelation 1:7)
Now read 1 Thessalonians 4:14-18 and 1 Corinthians 15:42, 51-54. This means new bodies like the old but instead incorruptible. There is no doubt amongst commentators that these passages are about the Return of Christ and the resurrection of the saints.