I would let them grow taller now. You're in flowering so I would try to minimize stress now, stems will start hardening as well and you don't want to break anything.
From what I can see in the pictures, you don't have much room to make the plants any wider anyways so just let them grow.
Being they're Autos, it limits your time on training.
I like to top Autos at day 14 from sprout, then wait for the 2 new branches to grow a little (couple days) and then start LST.