Major congratulations, Chris. Glad that you didn’t ned to be anxious about the checkerboarding.
I would wait, and use the usual golden rules. You need enough bees to fill and defend the new space. I would not add any more boxes until:
Every frame has fully drawn comb, and
The comb is 80% full of honey, pollen or brood, and
Every frame is well covered with bees.
Golden rules for a strong hive. 