They are looking to be close to the chop block. Like the others said get a scope, and check em out so you can time the flush, and cut very well. I also agree with the other statements of Roseman's but like he said you will need a fdew grows under your belt of this strain to know its idiosyncrases then you can base of of pistal colour, a rough timeline, specific changes that occur with the buds when the plant is nearing full maturity, ect.
The tips of your leaves are burn a bit, what did your CO2 meter break?
That chart is great Roseman I had to save it lol