High Nirod
6 weeks does seem a bit early for that many brown hairs but with lots of fresh white ones standing up the buds are still popping out flowers. What is supposed to be the total flowering time for that strain and are they grown from seed or clones from the same mother?
If seed grown then some will likely mature before others depending on how stable the strain is the seeds are from. If clones from the same mom they should all be the same but things like location in the grow room can influence plants too.
Checking out the trichs is what you want to base your time to crop on. I chop mine when there is almost no white hairs anymore and the trichs are 50/50 clear/cloudy with maybe a few amber ones here and there tho I don't wait for lots of amber.
Looking good!