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I’m going to say it’ll be fine. Obviously I could be wrong but lots of plants are hugely more resilient than most gardening books/advice suggest. They want to live, ultimately. Might sulk for a season but shouldn’t suffer too much if you don’t damage the bulk of the roots.
Edit: Ah just reading again, you should try and heel it if you can for the week it’s out the ground. A big pot and plenty of water would be helpful.
I know it’s the wrong time to do it (and it’s on its side) but this apple tree has to be moved for the new garden plan. What are the chances that is will survive being dug up and planted in the same garden about a week later?