Hmm, I can't seem to find it, but it was some article maybe half a year ago, where in the end they managed to render some model of a rabbit with shaders and all. Am I remembering something else here?
No. That has indeed happened. It was a work by Alyssa Rosenzweig [0].
If I understand correctly, she implemented the userspace Mesa driver. The kernel driver is being developed by Asahi Lina. Together, they are meant to provide "full open source graphics stack for 3D acceleration on Asahi Linux" [1].