https://www.gamespot.com/articles/destiny-2-removes-the-need-to-hunt-for-xurs-locati/1100-6453368/

Many Destiny veterans were disappointed that they had to wait an extra week before the first appearance of Xur, but he's finally here. The mysterious merchant has shown up for the first time in Destiny 2, and there are some notable changes to the way he operates.

Xur will return each Friday and stick around until Sunday. Today also marks the debut of another part of the game, as the Trials of the Nine multiplayer mode will come online for the first time. That is set to go live at 10 AM PT / 1 PM ET / 6 PM BST.