Transition 2:1 nap

We started the transition From 2 to 1 naps about a week ago. My son is 13.5 months old and wake up is 6 am. Originally his first nap was at nine or 9:30 AM. We pushed it back a little by little and now today he went to sleep at 11:15 and slept til 1:15. Our goal is 12-2/3 pm.

tonight he went to bed at 6/610. What is the proper wake periods for 1 nap. If he ultimately sleeps 12-2 or 3. Should bed be 730? Am i doijg this whole transition thing right???