Nvidia has published a blog post detailing changes and new games coming to the GeForce Now game streaming service. GeForce Now native apps on Windows and macOS are now able to stream games at 4K resolution, at up to 60 fps. The high-resolution game streaming option will only be available to users of RTX 3080 subscription tier.
https://www.notebookcheck.net/4K-60-fps-gaming-at-20-per-month-Nvidia-GeForce-Now-apps-on-Windows-and-macOS-can-now-stream-games-at-4K-resolution-at-a-silky-60-fps.617467.0.html