If you weight some portion of the plant that is representative of most buds, you can guesstimate moisture percentage remaining.
this along with snapping the 'right-sized' stem is a good sign. over time, you will gain familiarity over things that are not well defined. Conttext matters... thick stems won't snap when it is dry enough, for example. tiny twigs will snap long before it is dry enough.
get a small hygrometer you can put in the curing container. If it cannot control humidity, myou know the material is still gassing off moisture. 55-62% will result in that 8-12% range or whatever target they say you should go for. If it's supposed to be higher for vaping, go with the 62% 2-way humidipaks from boveda.. not integra boost, they suck and don't control humidity worth shit.
if a 2-way pack can control the humidity, it's 'dry enough' for cure. keep an eye on it, as those 2-way packs can only hold so much mass of moisture. if it fills up, the RH will rise. You can weigh teh 2-way packs to know how much they've sucked up or released. This tells you if the buds are gaining weight or losing weight (inverse relationship, obviously). Law of conservation of mass.. if the 2-way pack lost weight in a closed container, then that moisture is either abosrbed into the plant material or condensed on the jar, which shouldn't occur in common sense temperature ranges, so it's being absorbed by the plant material almost 100%.
deductive reasoning can be used to determine when the buds are at equilibrium with the RH of container. 62% should result in the resulting moisture range of flower that you want. 55-62% is the range you want to stick to in a more general sense.
When the outside feels dry, i wait 12-24 hours longer before putting into my containers with 62% RH 2-way packs. Rarely do i ahve to take them back out onto the drying racks. This may take longer for a full plant or an entire limb. Take some notes, it helps. you don'dt want wet bud in a closed container... end up growing fucked up bacteria and shit.. the more often bad kind (anaerobic)