Hey there you have a pretty bad case of aphids and it is a bad time to try to treat it since you are close to harvest. I use ladybugs to kill off aphids and most other pests. It will obviously take time to get them and a few days for them to kill the bugs. I wouldnt use insecticide soaps and oils this late. Since you are making a tincture you can use a water hose to wash most of them off but it wont get rid of all of them and can damage some of your trichomes. I would personally either order the ladybugs if you can get them fast or just harvest the plant. Wish I had a quick fix solution for you but pests are harder to treat in flower.