https://wccftech.com/xbox-cloud-gaming-now-available-to-all-xgp-ultimate-users-on-pc-quality-upped-to-1080p60fps/

On the same day it officially released on iOS (bypassing Apple's Store thanks to a Progressive Web App based on Rainway technology), Xbox Cloud Gaming also became available to all Xbox Game Pass Ultimate users on PC.

Just like the iOS implementation, the PC one is also based on browsers, though Microsoft previously confirmed the intention to add Xbox Cloud Gaming directly into the Xbox app. On PC, Xbox Game Pass Ultimate subscribers can use Edge or Chrome to get started here.