I don't think it will ever happen. Apple has essentially stated that the openness of macOS is not something they'd repeat. We are also on Gen 6 of the iPad Pro

I don't think it will ever happen. Apple has essentially stated that the openness of macOS is not something they'd repeat. We are also on Gen 6 of the iPad Pro a device that could very easily replace a laptop both in specs and feature set that is continually hampered from doing so. And there was/is countless rumors that Xcode will finally land on iPad and the best we've gotten is locked down and limited Swift Playgrounds.