Still waiting for this one to hatch. It's been a full day of healthy chirping, and still no external pip. Chick is definitely still growing, but it looks like the membrane is starting to yellow. It's still clicking a little bit and doing the chewing motion, but it is definitely moving/trying to move around in there. Intervention time?
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It doesn't need to pip because it's open. Apply some antibiotic ointment without pain relief to the membrane to make it translucent. If the blood vessels have receded then you can assist. If you see any blood at all, apply gentle pressure and continue to wait (I have a q-tip on hand and ready just in case when doing this to apply pressure with).