i would say you still have some flowering time left on those
things you want to look for to tell if your plant is ready.
1 - The hairs on it turn a reddish brown and dry/shrink
2 - The trichomes go from clear, to cloudy, to amber. the more amber you have means the more likely your plant is done. clear means the thc is still developing, cloudy it is developed, amber it is developed and slightly degrading.
3 - The leaves turn yellow and fall off
4 - The plant is like hey yo.... harvest me already.
the lighting on the side did not damage the plant, please look up vertical growing for further information. The lack of light at the start might have had something to do with it. Transplanting will definitely have something to do with the stunted growth at this point in the cycle. reduce the nutrients? if your plant had nute burn then maybe but from the pictures i cant tell. Too much nutrients usually has a slight drying/browning/damaging of the leaf tips and edges. I have not had windburn on my plants even with seedlings in direct wind. most autoflowers take 3 months minimum. with the transplant it might take longer, dont rush it. you probably want the best you can get out of your stuff so give it that extra week or two and let it mature properly.
To cure, you can read all the information in the curing section. Essentially you cut them down, cut off all the large fan leaves and hang them upside down in a dark cool place with air movement. leave them there till they get slightly crusty/prickly on the outside but still moist/bendy on the stems. the stems should not break, this means you might have left them out too long. could be a day, could be 3. take them out of the dark and trim off the remaining leaves. or keep them if its percy. cut the buds down to a manageable size and put them in an airtight container. Mason jars work very well. put them in and seal the jar. every 12 hours open the jar and left the moisture out. if the buds are damp to touch, empty the container and let them chill outside for a while 10 min - 30 min. put them back in the jar and seal it. in another 12 hours, rinse and repeat. This is called burping. burping helps ensure an even moisture content throughout the entire bud. curing can take 2-4 weeks. essentially you are putting them in the jar and raising its relative humidity because the buds have alot of moisture in them (more then the surrounding air) and by keeping it in the jar it lets the moisture come out evenly from the entire bud instead of just the outside of it, leaving a wet rotting mess on the inside. you can find more detailed info throughout the site and in the curing/advanced tech/general growing sections