seedling - vege - flower... clearly flower. These labels help interpret but life is a spectrum.. .constant change over time. the labels only help break it down into understandable bits.
it's done when it is done... yes a useless circular logic, lol. You simply observe and react... if you don't like the results from your timing or want to experiement with early-to-late harvest window, change your trigger next time. Be consistent so you can compare and make a choice. it comes down to personal preference.
how much amber? (trichomes on calyxes only) Are the buds dense or fluffy? (relative to genetics). Are the pistils mostly turning color? Do they look short or long? (calyxes plump around them - an illusion that they shrink, but do eventually coil up)
Things you can observe are your trigger. Exactly when may take you a little trial and error.