One of the breeders was talking about doing this for THC plants to find the best harvest window. Harvesting a little every week then getting each level of harvest tested. Same theory should work but unless you want to drop $$$ on testing it would be easier to just take notes
One thing that was interesting was that on the particular strain he had tested the THC and total canabinoids were higher earlier than it should have been. Like when the first ambers showed instead of waiting on a percentage. This was just one strain but it could basically mean that each harvest window is strain dependent.