Its probably going to continue to flower for a few weeks then begin to reveg once days get a bit longer. As long as you keep it healthy it will return to flower in the fall and finish accordingly...
4 1/2 feet tall now and another 2-3 months veg for the summer season that thing is going to be a fucking monster make sure you have it in at least a 30 gal container man if you can get a 55 gal drum that would be even better, you will have a 10 lb plant by end of summer if you give it the room to grow and proper nutrition