First; look at your weather forecast. You want temps in the mid 50’s to low 60’s with RH around 50%. If done artificially that’s where I’d shoot for.
Plan to remove most of the big fan leaves and dead/dying plant material ahead of harvest day. A week or so is good.
I run water-only for the last couple of weeks and monitor the runoff TDS. When it hits an arbitrary value I set for myself the plant/plants go into darkness.
36 hours in dark, plant is cut down from a darkened grow space.
I always perform a bud wash in H202.
Plant material is hung and monitored. When I feel outer flower is getting dry, the plant material goes into a clear tote with lid and fan and I adjust the lid gap to produce more or less airflow. At night I drop a hygrometer in the tote and seal it to determine where I am the next day. 7 to 10 days to dry harvest is ideal to maintain volatile oils/terpenes.