Jamieson, Fausset and Brown on Revelation 11:17

17. thanks--for the answer to our prayers (Re 6:10, 11) in destroying them which destroy the earth (Re 11:18), thereby preparing the way for setting up the kingdom of Thyself and Thy saints.

and art to come--omitted in A, B, C, Vulgate, Syriac, Cyprian, and Andreas. The consummation having actually come, they do not address Him as they did when it was still future, "Thou that art to come." Compare Re 11:18, "is come." From the sounding of the seventh trumpet He is to His people Jah, the ever present Lord, WHO IS, more peculiarly than Jehovah "who is, was, and is to come."

taken to thee thy great power--"to Thee" is not in the Greek. Christ takes to Him the kingdom as His own of right.