yeah flower now or those will be monsters- if you havent already you may want to top... but those are way bigger than mine which i put into flowering a week ago and have already shown sex- not all the way but most... so i would go for it... Do some reading about doing a 36 hour dark period first- i highly recommend it- but it is controversial...
Here's my thread about it,
https://www.rollitup.org/indoor-growing/76790-36-hours-darkness-after-veg.html#post887625
Alot of the worlds best growers recommend doing between 24-72 hours of darkness depending on strain, when indoors to induce flowering...
Let me know what you do and how it goes- great looking veg plants tho! off to a good start, first time?