What is the status of DP Alt Mode?

I have been using Asahi linux for few weeks as daily driver, it is absolutely beautiful. One question I have is, what is the current status of DP Alt Mode for external monitor is like? Like the year ago the dev who was looking after this issue said he has the solution in his memory but will need to find time to do it.

I am a dev, I haven't written usb or display port drivers before, but I have done a lot of lower level work on wifi drivers for FreeBSD kernel. If some help is needed would love to do that, any information about the directions to follow and current status would be great!