Hey Ex, so if you had some autoflowers out there you'd be golden...they'd start to flower when ever it was their time. But with your photoperiods they wont start until they can get 12 hours of uninterrupted dark. So this plant will keep putting out new branches and leaves until either the season changes or if you move them into a dark place for 12 hours each day. During flowering it won't make new growth. That's why having the plant very healthy before the change is the best thing we can do. Yours looks healthy, so just give it good direct sunlight and tlc and it'll stay just as normal as anyone else.
Happy growing and good luck with the grow.โ๏ธ