"And all the angels stood round about the throne...and fell before the throne..."

Did Rev. 12 come to pass first in chapter 7?
"And the great dragon was cast out...and his angels with him."
"...which accused them before our God day and night."
"And they overcame him..." v 11

Rev. 12 occurs in Rev. 7?

Rev. 7:13
"...whence came they/"
"...they which came out of great tribulation..." 7:14


So where in Rev. 7 is the time when John watched the great tribulation?

It was between verses 7:1 and 7:2, and then we continue to when John heard the numbers that were sealed.
"were" had been sealed already

Ok, now consider how in Rev. 7 all the angels stand together. Rev. 8 then goes back in time to tell of when seven of those angels had been given trumpets (were given) and what happened when they sounded. The trumpets will sound, and then all angels will stand together before the end of Revelation 7.