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I would not expect that to be a sign of coccidiosis. He just wanted to rest. My chickens lie down on their sides in the sun all the time.
However, you should definitely quarantine this new bird for 4-6 weeks before letting him have contact with your flock.
If he comes down with coccidiosis, it is most likely to happen in about 2 weeks - or about 2 weeks after he starts scratching in your soil. He is most likely resistant to the cocci protozoa that were active where he came from, but if different strains live in your soil, he could easily have a bout of coccidiosis in a couple of weeks. So it's definitely good that you ordered the meds - did you order Corid? I always keep that on hand. ACV is great; it can't do anything but help him out. I would just give him a chance to get acclimated at this point - and quarantine him to watch for any sign of respiratory illness. Respiratory diseases can hide, and they can take out your whole flock.