https://www.gamespot.com/articles/heres-when-destiny-2s-raid-begins-when-servers-go-/1100-6453052/

With Destiny 2's release coming up next week, Bungie has now answered more key details about the launch and more. Starting off, Bungie confirmed when the game's servers will go live: it'll be a rolling midnight release across the world. That means you can start playing at 12 AM on September 6 in your country. In the US, this means the servers will unlock at midnight ET.

While Destiny 2 won't unlock until September 6, people on PlayStation 4 can pre-load starting right now if they pre-ordered. There is no word as of yet regarding pre-loading for Xbox One and PC, but those details should be announced soon.