By this age, it is way more about what works for him that what the averages are. If he goes down for naps well, naps two hours or however long, wakes content, and is happy to go to bed at bedtime, that's fine. The nap will gradually shorten itself naturally. If not and you find yourself dealing with bedtime struggles or early am wakeups, you can make little adjustments, perhaps moving it a bit earlier or waking him. But if he is napping less, still waking happy, and not super-grizzly by bedtime, I say he's doing fine.
FWIW, dd will be three in January. She doesn't nap every day anymore, maybe 4-5 days out of 7, but she routinely sleeps 11ish hours at night AND still takes a 2hr nap.