This may depend upon your breed and incubation technique.End of day 19 for me... I kind of thought they'd be rocking already?
Can someone list off milestones and when to expect them (like rocking, internal pip, etc)?
*chicken eggs, btw...
Did you draw in your air cells on the eggs? If so, that's where you are looking for that pip. They will pip internally first and usually follow with the external pip within 12 hours. However, you won't see this internal pip unless they go early and you are doing your 18 day candle or they are late and you are checking them for viability.
After the egg pips externally they usually rest. It may be another several hours or 12 hours or so before they start chipping a circle around their shell. Then they pop the top on it and they flop their head out...you swear they will asphixiate because their little head is usually flopped over...they will flop around and fall on their backs and their heads and then sleep and then fumble around some more.
I usually don't see mine rock because I carton hatch for the most part.
Day 19 is early for rocking...I would start looking for something on day 20...day 21. I think the first thing you may notice is just a tiny fracture in the shell.
Hardest part is just watching...and not doing anything...and not opening your incubator. Good luck!