Look at this carefully:
" Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:
30 and then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
31 And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other." ( Matthew 24:29-31 ).
See also this:
" But in those days, after that tribulation, the sun shall be darkened, and the moon shall not give her light,
25 and the stars of heaven shall fall, and the powers that are in heaven shall be shaken.
26 And then shall they see the Son of man coming in the clouds with great power and glory.
27 And then shall he send his angels, and shall gather together his elect from the four winds, from the uttermost part of the earth to the uttermost part of heaven." ( Mark 13:24-27 ).
Immediately after the tribulation, God shall send His angels to gather His elect...from everywhere they currently are. To bring in 1 Thessalonians 4, which describes His second coming, Jesus Christ shall descend from Heaven with a shout, and with the voice of the Archangel and the trumpet of God.
Has any of that happened yet?
Not that I'm aware of.