At day 47 shouldn’t they be flowering by now??
I think I see preflowers.
Most of my autos flower during the 6th week in hydro, but some have gone 8-10 weeks before flowering.
The longer to flower, the longer the veg, the bigger the plant, and the bigger the yield.
My plant that took 10 weeks to flower went about 19 weeks total, and yielded almost a pound.