Relax, really RELAX... Maybe go out for the day if you can't leave them alone...
Many times they pip then take a good long deep nap before they start to zip... Until 24-36 hours have elapsed after the external pip with no activity there is litttle need to worry, just give the chick a chance to do what they do... After that external pip they need time to absorb the remaining blood and yolk, rushing it could be fatal...
If there is absolutely no more progress after 36 hours then you can have concerns, until then it's time to sit and wait...