Hey!
Those trichomes are on peak!!
Cloudy, milky whatever you want to call it lol
They're on full with THC, you can go ahead and cut them whenever you see fit.
Harvest window opens when you start getting amber pistils.
The best way to check is looking at the trichomes on the buds with a 60X magnifying loupe
Clear trichomes haven't reached their full potency, cloudy ones are full of THC and amber are losing THC while gaining CBN.
I harvest when after examining and finding 70% cloudy trichomes and 30% amber trichomes.
For me that's a prefect combination, depending on the strain as well.
With some strains I go with lower amount of amber trichomes but always attest 10%.
This really depends on what type of high your looking for.
As for what they look like, clear trichomes look like shiny glass, cloudy like plastic and amber like resin
Hope this helped.
Good luck and happy harvest!