Transplanting During 12/12 ?

I am at about day 30 of 12/12, i started my plants in 2 gallon pots, i have recently acquired a few 3 gallon pots, should i transplant to the larger pots ? Or just let em go. I am not sure if only 1 extra gallon would be worth it ? Any advice ?

If the plant is small I would just leave it in the two gallon. It looks pretty far along.