Don't underestimate their air defense, it's not dead yet. I'm sure they're conserving interceptors so they don't actually fully run out, and can still deny airspace to more expensive platforms Ukraine would like to use along the frontline.
Their problem has always been too much area to protect, and drones being hard to deal with in general for modern air defense. Not that their air defense is actually useless or anything like that. There's still a lot of degrading that needs to be done to it.
If that were true, then Ukrainian airpower would be obliterating the Russian army with good old dumb bombs, while Russias fighters were kept at bay by Ukrainian SAMs and the drone threat to their airfields.
Not sure why you're so desperate for this to be true, there's nothing wrong with acknowledging that more work needs to be done. Declaring success prematurely is unnecessary.