After 7 days hatchability drops significantly Ryan. After 10 days I wouldn't bother. They need to stand for 24 hours after transport, the severity of which also affects hatchability. Depends how old they are in the first place and also the conditions of the parents and their diet. So basically every moment counts. I'd start the incubator the moment they arrive and get them in 24 hours later.
Hens will lay a large pile but probably only half will hatch. If more it's possible another hen is laying there as well.