1 nap help

I am feeling insecure about my (almost) 12 month old’s 1 nap schedule. His wake up is varying between 30 minutes and that is STRESSING me out. He is also getting an accidental micro nap on the way home from daycare Mon-Fri because he is extra tired. This is pushing bedtime to around 8pm (which is fine with me). What should I do? His wake windows are usually around 5/6.