I think you mean Day 58 of life cycle not the flower days…
First 3 weeks, leaves Are crucial for bud development ( only defoliate of they overshadow 3 bud sites or more)
Week 4-6 a balance between Photosynthese Rate & bud quality ( defoliate a Bit, it‘s a sacrefice of mass for quality )
Week 6-8 Budds don‘t get bigger anymore, plant don‘t need photosynthese to build biomass, trichomes & terpenes ripe at this Stage, light on bud Sites will enhance ripening process
All this is based on a perfekt 8 Week flower cycle, in real life it often takes a bit longer, but thats the Basic concept