https://www.gamespot.com/articles/destiny-2-xur-location-guide-where-is-xur-and-what/1100-6454049/

It is Xur day my dudes! Which means it's time to once again look into the Destiny 2 merchant's cavernous void of a face and shuffle through Exotic wares to find something that tickles your fancy. Don't get too close though, who knows what those weird tendrils will do.

This week, Xur has planted himself on Nessus. It's fairly straightforward to get to him as he's popped up there before. Simply fast travel to Watcher's Grave and then scoot over to the tree in the north end of the area. You'll spot him lurking at the top of the large tree. He has the usual array of three pieces of Exotic armor and one weapons for sale. Here's what you can expect to find.