Hey that's awesome!
Yea earlier when we were setting eggs we talked about the "waiting period" for shipped eggs prior to setting them. It was theorized that during the summer months development could start in transit due to the heat in the trucks and the usually well insulated packaging. Our thinking was, we didn't want to interrupt development or even kill the embryo by letting the eggs get cold. What some of us did, was rather than sitting them on the counter and letting them rest at room temp, we set them in the bator right away and just left the turner off for 24 hours (the usual rest time for shipped eggs). This way the eggs kept cooking (so to speak) and still got the rest needed for the eggs' contents to settle.
The results were somewhat mixed though... I plan to do this again next Spring and see if my results are different but this was the best hatch % I've ever had, 84% on shipped eggs and 87% overall. AND my shipped eggs did pip 2 days before my backyard eggs, so there is something to our theory, even if, like I said there were mixed results. Everyone agree?
Good luck on your hatch! We'll be looking for pics on the 21st ☺