Bitter Judgment! Sweet Hope!

Bottom line: Jesus is setting all things right which means He is judging all things wrong.

Chapter 10 is within a parenthesis between the 6th and 7th trumpet judgments. It is written to encourage the readers that the final judgments are coming and coming soon.
The mighty angel takes an oath and swears that "there shall be delay no longer." There will come an appointed time when God will delay His judgment no longer, but until then He does delay. He is not willing that any should perish but that all should come unto repentance. (cf. 2 Pet. 3:9)
While we live the delay may we faithfully share the sweet hope there is in for all who accept and receive Christ as Savior and the bitter judgment that is coming for all those who reject and refuse Christ as Savior.