Hello
Are you planning to let them flower outdoors? I ran my outdoor in 15 gallon smart pots, they each we're a little over 6 feet when finished and they handled it great. I would suggest putting them into 15-20 gallon pots, if you can get fabric pots great, but if not plastic/terracotta will do. With those long outdoor grows I would say the larger the pot the better.
I would let them run their course outdoors if you can, the grow will be long but the rewards in the end are unmatchable indoors.✌️