Harvest or not?

Looks to me that you're a couple weeks or more out. Still showing lots of white pistils. Buds look like they still have some swelling to do.

Always let the plant dictate. What the breeder said is a guess. You are not that close. Lots of ripening before you start bothering to check trichomes. Once the calyxes plump you still have 2-3 weeks or longer for a slow-flowering plant. Most plants take 8-9 weeks, and if it is an auto count from 7-10 days prior from first easily visible preflowers as a more apples to apples comparison for expected timeframe.

Your tops will be least matured and all airy and foxtailing. They grew too high, you needed to supercrop plants or train them more or in other style. By look you are 2-3 weeks away from harvest. Part harvest never brings prifit, better use that time and start new grow. Plant will need to heal up wounds...

Nowhere near ready.............another three weeks at least still to go...............maybe even four. Patience!