I belive you can harves the CBD sometime this week.
With regards to the Gorilla Glue, keep checking the teichomes on the buds and try to harves when 20% of the trichomes are amber. This estimates that the rest of your trichomes are milky.
If you want a more Indica type high you can opt for more amber trichomes and if you want a more sativa tyle high, you can opt for less amber trichomes. This is because the amber trichomes are the degraded THC trichomes that have turned to CBN
Good luck with the rest of your grow and enjoy the yield