It has not been fulfilled yet because it is not due to be until Jesus' future arrival.
[1 Thessalonians 4:15-17…the Lord himself will descend from heaven with a commanding call, with an archangel’s voice and with God’s trumpet, and those who are dead in union with Christ will rise first. Then we the living who are surviving will, ‘at the same time’ with them, be caught away in clouds to meet the Lord in the air; and thus we shall always be with the Lord.]
[Matthew 24:30 And then the sign of the Son of man will appear in heaven, and then all the tribes of the earth will beat themselves in lamentation, and they will see the Son of man coming on the clouds of heaven with power and great glory. 31 And he will send forth his angels with a great trumpet sound, and they will gather his chosen ones together from the four winds, from one extremity of the heavens to their other extremity.]
[1 Corinthians 15:51 Look! I tell YOU a sacred secret: We shall not all fall asleep in death, but we shall all be changed, in a moment, 52 in the twinkling of an eye, 'at' the last trumpet. For the trumpet will sound, and the dead will be raised up incorruptible, and we shall be changed.]
[Revelation 11:15 And the seventh angel blew his trumpet. And loud voices occurred in heaven, saying: “The kingdom of the world has become the kingdom of our Lord and of his Christ”]
[John 6:39 This is the will of him who sent me, that I should lose none out of all those whom he has given me, but that I should resurrect them on the last day.]
[Rev 20:6 Happy and holy is anyone having part in the first resurrection; over these the second death has no authority, but they will be priests of God and of the Christ, and will rule as kings with him for the thousand years.]
[2 Peter 3:8 However,
do not let this escape your notice, beloved ones, that one
day is with Lord as
a thousand years and a thousand years as one day.]