The development of the SteamVR Driver for Vision Pro is currently underway, which will include support for VR controllers. - Road to VR
SteamVR Driver for Vision Pro Now in Development, Including VR Controller Support
iVRy, a project dedicated to bringing SteamVR support to unsupported headsets, is working on a SteamVR driver for Vision Pro that aims to bring unofficial SteamVR compatibility, including VR controller support. This comes after independent programmer Zhuowei Zhang installed a modified version of the Wi-Fi PC streaming app ALVR on Vision Pro, giving users a glimpse of SteamVR compatibility. iVRy's announcement has been approved by Valve, and they plan to offer it through Apple's App Store. However, it may take some time for the driver to be fully functional. Additionally, bringing motion controller support to Vision Pro is a challenge, as it doesn't support them natively. The iVRy Driver supports various VR controllers but will require a Quest 2/3 as a controller hub. While iVRy for Vision Pro is not a plug-and-play experience, if users are looking to play SteamVR games right now, it may be better to purchase a separate headset that is officially supported. For the full story, users can visit the source at Road to VR.
Source: https://www.roadtovr.com/steamvr-vision-pro-controller-support-ivry/