Most autos are not finished in 8-9 weeks tbh, most take 10-14 from my experience. The first 4 weeks are veg cycle, as soon as you see preflowers, move to the next section which is the flowering stretch, then the next section is flowering and the final section for end of flower. You will just have to judge what to do and when. But I can almost guarantee they won't finish in 8-9 weeks and as you're using coco they'll need more nutrients than soil would 🌱👍