Oh my gosh!!! You are soooo lucky!!! Be happy that he is going to bed early because that will change. And it will change several times. You'll be saying "I wish he'd just go to sleep!!!"
I don't think there is a "set" time they should be going to sleep. My son, who is 2 now, went to bed around 7-7:30 when he was that young and it changed all the time. Just when I thought we had a good schedule he'd change. All children are different, you can't really say this or that is the "right" time. If he is tired then let him go to sleep, don't try and keep him up, unless there is a reason to. Take advantage and have time for yourself.
I have got two now and I hope everynight that my son will go to sleep by 9:00 or 9:30. I have to start at 7:30 for him!!! My daughter who is almost 3 months goes to bed as early as 7:00 or as late as 10:30!!! Luckily she then sleeps like 8 hours, but I do'nt know everynight what is going to happen!
Good luck and relax, have some wine (or soda), which ever you prefer!