Revelation 10:7

"But in the days of the sounding OF THE SEVENTH ANGEL when he is about to sound, THE MYSTERY OF GOD WOULD BE FINISHED.."

 

The mystery of God is finished AT THE END of the great tribulation when God's two witnesses are killed and ascend  just before the SEVENTH ANGEL SOUNDS according to :

 

Revelation 11:12 and 11:15 

 

Come Lord Jesus !