Is the pot my plant is in large enough for flowering?

i believe its a 2.5 - 3.5 gallon pot but i was planning on moving her to a 10 gallon because i read that 1gallon = 1 ft even though she's already 20" tall in this pot and still growing.

P.S. I'll be putting her outside in the next pot.

looks fine to start flowering. But if you're growing outside, she won't flower for a few months