https://www.polygon.com/2017/11/2/16598068/destiny-2-servers-down-offline-time-patch-1-0-6

Destiny 2’s servers are going down for a few hours today as developer Bungie performs maintenance and releases a new patch.

Work began at 11 a.m. ET, at which point nobody could sign in if they hadn’t already been playing Destiny 2. At noon ET, Bungie will boot all remaining players out of the game. The maintenance window is scheduled to end three hours later, at 3 p.m. ET. By that point, Bungie will have released the version 1.0.6 patch for Destiny 2 on PlayStation 4, Windows PC and Xbox One.