Yes, at this late stage, your plants metabolism has slowed down remarkably, so all is normal.
It is the slowed metabolism that causes late picked flowers to have lowered THC content and elevated CBD and CBN levels due to the slowed metabolism being unable to replace THC faster than it is breaking down into CBD and CBN, producing flowers with a heavy and sleepy body stone. If you prefer a more clear head trip type of high, harvesting soon would be my advice.
Hope this helps,...........
Organoman.