It looks good, Anki should be visible in the task manager, but I’m not sure why you don’t see any GUI window.
I can only suggest to install Python 3.8 (Windows x86-64 executable installer) and try pre-built Python wheels.
- Run Anki from a local Python installation without building it yourself
https://github.com/ankitects/anki/blob/master/docs/development.md#pre-built-python-wheels