My son DID switch from two naps to one at around that age, though I don't remember exactly how old he was. His single nap was longer, though, around an hour and a half. Gave it up completely btw 2.5 and 3.
Two recommendations for you:
First, if you want to institute a "quiet time" hour, make it fun and productive for your son; don't just stick him in his room if he's mad. My friend's son has a ritual of quiet time with paper and crayons, and it's helped him develop into very artistic little boy with good concentration skills.
And second, don't fall into the trap of thinking you can only get work done when your son's asleep. (I did that to some extent myself; I'm not being holier-than-thou). Instead, recruit him as your "helper." When I finally got my act together on this, I put my son in charge of putting all non-sharp, non-breakable dishes away (okay, so that's like 3 dishes total, but he's he's little & distractable). He now can put his own laundry away too, though not folded. If I'm paying bills, my son "helps" with the calculator. The key is to avoid letting your kids think housework is mom's job and mom's job alone. We all know where that leaves us in the end.....