Hi Laura,
The A time to bed might be a little longer than Oliver can handle, and his pm nap could be slightly later. Could you try nap at 1:30pm?
Eventually, I'd also move the morning nap to 9:30/9:45 once he's settled on the 1:30 pm nap. It's a bit early for his age and too early of a first nap can lead to early wake ups.