A.K.
Well, taking away his naps really depends on a lot of things. Does he still show interest in wanting a nap? Does he go to bed at bed time well? Is he cranky through out the day without a nap? Look at these answers and decided if taking the nap away would make sense. If you don't want him to wake up so early try to instill that when he gets up early he needs to stay in his room until you come and get him. That way it will be a little easier in the mornings.
Since he is in daycare, you will have some difficulty cutting out the nap entirely. When my son entered Kindgergaten he was on ly a half day, so if he was tired after school I would let him take a short nap when he got home. But we tried to stay up to get used to his new schedule.