Where are the 144,000 who will testify during the tribulation? Where is the "vast throng" (Revelation 7:9) that accompanies them? If the kingdom is approximately seven years away, these ought to be showing themselves soon, yes?

They will not be showing THEMSELVES, but God will awaken them with a miracle akin to the Upper Room. These people live next door to you, anonymously, playing church, believing every wrong thing about God that could possibly be believed. And yet they are holy because they are the literally—that is, genetically—Israel of God and their blindness is about to be removed.