I’ve used the Oculus debug tool to do it but it displays a lot of information I don’t want. Would just like a floating fps number if possible.
OXRTK ( OpenXR Toolkit by mbucchia ) has that - just don’t enable all the rest of performance improvement options.
There is a VR product at Flightsimulator.me called “all-in-one” tablet. The home page presents FPS on the top left corner.