125lm/w might be a bit low efficacy, but 600w in what looks like a 4'x4'? (120x120) .. if so that should be okay for 12h operation. Can always eke out a bit more using 13hours of light during flower phase.
You only need aboout 2-2.5 colas per square foot to maximize yield. 16 sqft would be food with 35-40 colas. Probaby 50-60 there? Even after flip you have 4 more weeks of solid vege growth before it ceases. It'll grow into a mess. You may have overgrown a little and have too many mouths to feed, which will increase larfier buds -- if you extract oils, that may be a benefit, but not if smoking flower.
Will probably have to thin it out a bit to allow for 4 more weeks of growth after changing light cycle to "12/12".