3.9 wheels will be available for the next non-patch version and we already have them for then nightly release 
✨ Prodigy nightly: spaCy v3 support, UI for overlapping spans, improved feeds & more
Something else we've been planning: We want to provide a PyPi server that allows users to download Prodigy using pip install and their license key, and that will automatically select the best wheel for their platform. This means we'll be able to build more wheels. Building combined wheels is nice in theory, but changes to pip and setuptools mean that users may run into problems depending on their versions, and it's something we can't control. There's also a growing number of Python versions and platforms we want to support (e.g. Python 3.10 soon, the Apple M1, and so on) and we don't want people to have to choose their wheel manually or download huge files every time.