Another time, if you have late hatchers at day 24 that you think are goners, (or if there is any chance of a mix-up on the dates, try the warm water test first to see if they are still viable, watch until they steady from putting them in, then watch for wiggles. Might save you and them from opening too early, and the moisture won't hurt them if they are at least day 18 and have suitable sized air cells as long as they have not pipped externally. If you can't see any movement from the air cell end with a bright light for candling and in a dark room, this is another idea before opening them up.
Hope all is going well with little Early Bird!