I have eggs I set on late Friday, so they are on day 4.5 I have eggs from 3 sources. Below we have a blue egg from North Carolina, they seem to be doing ok, I have had a few with saddles, but I kept them up right, and the lose air cells are solid now.
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Below is a white egg from a local source in the same town, they are doing well.
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below is a Meyer's egg it this one does have a saddle, but it is developing..
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Of all the eggs I do have some ? on a few Meyer eggs but I will give it a few more days.