If I may offer one correction to your first sentence, it is Jesus (the Revelation) who is the Alpha and Omega, as is stated in the first chapter of the Apocalypse of John, “ And from Jesus Christ, who is the faithful witness, the first begotten of the dead, and the prince of the kings of the earth, who hath loved us, and washed us from our sins in his own blood,  And hath made us a kingdom, and priests to God and his Father, to him be glory and empire for ever and ever. Amen.  Behold, he cometh with the clouds, and every eye shall see him, and they also that pierced him. And all the tribes of the earth shall bewail themselves because of him. Even so. Amen.  I am Alpha and Omega, the beginning and the end, saith the Lord God, who is, and who was, and who is to come, the Almighty.”. Jesus was the one speaking to John. So, it’s Jesus who is the Beginning and the End.
If you are asking about the “end of the world”, then we can also see in the Apocalypse that there will be a “new Heaven and a new Earth”. The physical world, that we know now, will be changed into a glorified world and our bodies will also be glorified, like the body of Jesus is, in Heaven. The Transfiguration of Jesus to Peter, John and James was a revelation to them, of a what a glorified body would be like. Of course, the Glory of Jesus is much greater than the rest of us will have. Each of us will receive a level of glory that will reflect our own personal holiness. This is what Paul meant when he said in his first Epistle to The Corinthians:  One is the glory of the sun, another the glory of the moon, and another the glory of the stars. For star differeth from star in glory.  So also is the resurrection of the dead."
I could be wrong, but I tend to think that particular title (Alpha and Omega) refers to Jesus being the beginning and the end of our salvation, which began when Jesus was born, and was completed with His Resurrection from the dead. It could be said that our salvation began with God’s promise of a savior in the Old Testament, but the act itself began with the Incarnation of Jesus. Ultimately, His whole life on earth was for one purpose, to reconcile us with God, by teaching us how to live a holy life through following His example.
Just my :twocents:.