https://www.gamespot.com/articles/destiny-2-servers-down-right-now-for-scheduled-mai/1100-6453265/

Update: Destiny 2's servers remained online for a bit longer than expected, but they're now offline. They're expected to remain down for the next four hours or so for Bungie to complete its maintenance period, which follows some instability last night and ahead of the launch of new game modes later this week. The original story follows.

Destiny 2's servers will go offline today for four hours as part of scheduled maintenance. The process will begin at 7 AM PT/3 PM BST/12 AM AEST, when players will no longer be able to log into Destiny 2 or the first Destiny.