I am sort of in the same boat. We started with 18 eggs and 6 are out so far, it's day 22. I have little hope for the other 4, BUT I did originally only want 6 eggs so I am happy. But only 1 chick is lavender so I may end up getting a few more in the spring.
How long should I wait to pull the chicks out? The last one hatched about 6 hours ago, I haven't seen any action from the other eggs so far. I know some people give them like 3 extra days.....I am sitting on my hands.
I would probably candle to see if there are any internal pips and if so, then make a tiny hole so that they don't run out of air. Check out the assisting guide on here. Honestly though, I have found if I wait days.... they are past the point of help. This is just my opinion.
It is better to have incubation conditions so that the chicks can hatch on their own but if that wasn't possible, help may be necessary to get (more) live chicks.