Are those winter peas or field peas, that generally come pre mixed with oats? You are definitely going to get some seed out of your oats. The seed won't likely have enough time to fully develop. I doubt you will be disappointed with the oats no matter how mature they get. My summer planted oats usually starts dying around mid December.
I'm leaving 4 acres of spring planted oats to see what happens with that. The everything is already golden and dry. My hunch is it will be all wiped out by February. I can't see them chewing on the plant though. Deer don't eat straw.
I brush hogged the other half of the field high, and there is seed every half inch. We just need the moisture to get it going. I know it's gonna germinate, I just want to get the most out of it, because they love eating it.