I agree, you still have some weeks to go, perhaps 4 or 5.
Harvesting when there are about 90-95% brown pistils will give you buds with peak THC, harvesting now would give buds that would only generate a mild buzz, not much else.
Once the flowers get to this stage, insects will generally leave them alone, so no need to panic about aphids etc. and as long as you keep the buds dry, mould should not occur.
Hope this helps, Organoman.