Jeremy's own term for the final set of actions before flipping to flower: top dress, trellis, train/defoliate, brew and apply compost tea, take clones, then 24–48 hours hang time before switching to 12/12.
Jeremy frames the entire episode around this checklist. He will not flip until all plants show full vigor and any water-stressed plants have rebounded. The goal is to take off smoothly into flower with the best quality and best yield.