Revelation 17 & 18
Wedged between the seven bowls of God’s wrath being poured out on the earth in Revelation 16
and the return of Christ in Revelation 19, chapters 17 & 18 focus on the destruction of “Mystery, Babylon the great”. In terms of the flow of tribulation events, the timing of these chapters seems to be established in the chapter before, chapter 16, where the judgment of Babylon is mentioned along
with other judgments poured out in the seventh bowl.
… And great Babylon was remembered before God, to give her the cup of the wine of the fierceness of His wrath.
(Revelation 16:19)
Thus chapters 18 & 19 are a detailed expansion of this chapter 16 event and their timing needs to be viewed in the context of this rather than as events that directly follow on from the end of chapter 16.