XQuartz 2.8.0 has been released for macOS 10.9 or later. I've been in touch with a couple of users and they report no issues so far. This is the first version with Apple Silicon support.

The XQuartz project is an open-source effort to develop a version of the X.Org X Window System that runs on OS X. Together with supporting libraries and applications, it forms the X11.app that Apple shipped with OS X versions 10.5 through 10.7.

Changes in 2.8.0

• Adds native support for Apple Silicon Macs.
• Removes support for versions of macOS older than 10.9
• Uses system libXplugin
• Removes build-time support for deprecated X11 libraries:
  • ibXaw8
  • libXevie
  • libXfontcache
  • libxkbui
  • libXp
  • libXTrap
  • libXxf86misc
• Removes deprecated commands:
  • gccmakedep
  • makedepend
  • xdmshell
  • xfindproxy
  • Xfake
• Removes xpyb
• Removes older libpng

Full release notes are here https://www.xquartz.org/releases/XQuartz-2.8.0.html