Good morning
So i can't speak for all cbd rich strains in general...but for myself and my closest grow friends we all noticed that our high cbd low thc plants seemed to need harvesting earlier than their thc counterparts. The medical seeds like candida, and then some 1:1 strains seemed to be ready about 1-2 weeks earlier than the other high thc plants of the same age.
So i would watch your cbd plants much closer as harvesting is close because they might have amber trichromes or all milky much quicker.