The Apple Vision Pro has been successfully integrated into SteamVR by a developer, although there are still some problems to address. - UploadVR
A Developer Already Got Apple Vision Pro Working On SteamVR, With Some Issues
The UploadVR developer, Zhuowei Zhang, has successfully ported ALVR, an open-source alternative, to the Apple Vision Pro headset. This means that Vision Pro can now function as a Windows PC VR headset. However, there may be some visual issues due to network conditions. Additionally, Vision Pro does not include or support tracked controllers, so playing many SteamVR games may not be possible. However, Vision Pro can still be a great choice for using untracked input devices in sim racing or flight simulators. For more information and the full story, please visit the source at UploadVR.
Source: https://www.uploadvr.com/apple-vision-pro-steamvr-alvr-port-demonstrated/