I've noticed if the membrane is turning brown or tan. You need to step in. I help in a steamy hot bathroom. The article I sent will help you help it. I use tweezers and pick at shell slowly. Let the chick help you out if it can, it will make it stronger!
https://www.backyardchickens.com/articles/guide-to-assisted-hatching-for-all-poultry.72886/
I would probably start helping. Not sure it's 100% the right thing but I would.