they will see the Son of Man coming on the clouds of heaven
How To Discern The Real Second Coming of Jesus Christ
"false christs and false prophets will arise and perform great signs and wonders, so as to lead astray, if possible, even the elect. See, I have told you beforehand. So, if they say to you, ‘Look, he is in the wilderness’, do not go out. If they say, ‘Look, he is in the inner rooms’, do not believe it. For as the lightning comes from the east and shines as far as the west, so will be the coming of the Son of Man."
Matthew 24:24-27
The Second Coming of the Son of Man
“Immediately after the tribulation of those days the sun will be darkened, and the moon will not give its light, and the stars will fall from heaven, and the powers of the heavens will be shaken. Then will appear in heaven the sign of the Son of Man, and then all the tribes of the earth will mourn, and they will see the Son of Man coming on the clouds of heaven with power and great glory. And he will send out his angels with a loud trumpet call, and they will gather his elect from the four winds, from one end of heaven to the other."
Matthew 24:29-31
Are There Already False 'Christs'?
Yes, from England, Brazil, Russia, South Africa, Zambia, Japan and the Philippines these, and others, all claim to be Jesus Christ, though none were seen by all arriving on the clouds of Heaven. Some are mad, some egotistical, and some in it to exploit their followers. "‘So if anyone tells you, “There he is, out in the desert,” do not go out; or, “Here he is, in the inner rooms,” do not believe it. For as lightning that comes from the east is visible even in the west, so will be the coming of the Son of Man." Matthew 24:26-27