The Xcode 26.6.0 RC 2 image has been released and can be selected as follows:
macos:
xcode: 26.6.0
Xcode 26.6.0 Release Notes | Apple Developer Documentation
Apple Silicon VM Image Info
Xcode 26.6.0 Build version 17F113 is installed at /Applications/Xcode-26.6.app
The full manifest of installed software can be found here