When to help a chick hatch??

[butterscotch62]

Hi everyone. We have a question. We have 2 broody hens sitting on eggs and today is day 22. One of the eggs has lost most of the shell and you can see the membrane of the chick. The chick is moving inside. Should we leave it alone and let the broody hen help it or do we need to intervene?

 

[That Quail Lady]

You should probably leave the chick alone, after they have made a pip in their shell it could take a hour to 3 days to hatch.
Has it actually Ziped yet?