Can you remove your betta male as soon the fry start hatching?

Yes.

Once a betta fish has spawned, the male fish should be removed from the breeding tank. Although many people claim that bettas are not great fathers and will eat their young, the male betta is actually a caring father. He tends to the eggs and removes the unfertilized ones, and once hatched, the male betta also carries the fry in its mouth until they are developed enough to free swim. So it's important to provide adequate food for the male betta. When the fry start to hatch, the male can be removed and the fry can be raised in a separate tank. This will help to ensure the survival of the fry.