Bonded pairs don’t always groom or show what we see as affection. One of our former forum leaders (Sarita) had a mother/son Dutch pair for may years and she said then never groomed etc. Just sat by one another.
Also, what happens in bonding can change over time. You might have one that groomed the other a lot during the bonding period, but later on rarely groomed their mate. And sometimes you’ll see more grooming and snuggling later on after theyve lived together for months.
So how many days is it they’ve been together now, without separation? If there is not tension and they are moving in and out of each others personal space without triggering any tension, I’d be inclined to leave them together. It’s a leap of faith. My big tell with a pairing is when one literally runs over the others head, or maybe nudges the butt and the other bun just lays there, barely batting an eyelid. Then I know they’re going to be okay. The trust is there.
For your own peace of mind, you could add something like a box that only one at a time could fit up on top. So it there was some chasing or persistant mounting, the “harrassed” bun could go up there for an escape. *If* you did something like that, I’d just recommend putting item in well in advance so you can be confident that itself wont cause any upset. ie. if one bun feels territorial over the new item. You’d also want to place it so it doesnt became a launching point to jump out of the pen.
If you don’t feel confident, it probably wouldn’t cause any great set back to separate them for the day. Preferably in 2 pens side by side if possible.