Doesn't hurt to wait. I would put a clip on one of the rootstock seedlings and see if they fit snug. If not just wait a bit longer. Looks like your rootstock seedlings are lagging behind a bit compared to your scions so i would probably wait a bit longer. I try to get them done early only because I'm fighting time with the weather and want to get them out asap. So i graft them when they are young since they have more time to heal before planting them outdoors. The longer you wait to graft them the more time you lose setting them outside and sometimes the graft wound is not totally healed even if the plants look like its fully recovered.
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