Hi there,
It sounds like they are on track, but not quite there yet.
A bonded pair will groom each other (some it’s one way grooming, but in most both groom), cuddle, share food (often out of each other’s mouth), and just generally be unphazed by the other bunny being near them.
I would try a supervised over-night (or 24-48 hours) in neutral space and see how that goes. If by the end of that they are showing those positive signs, you can move them to semi-neutral space and continue supervising. The move to their final home together and supervise for another day or two, depending on how they do. Sometimes buns back track a little when you move space to space, so they need more supervision after each move. Other’s seem not to care at all.
Really it’s good to trust your gut. In my experience, when a pair is bonded, it’s like all of the sudden they “click” and I don’t worry about them anymore. They are just SUPER relaxed around each other and seem very happy. 
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.