From what I've seen most autos generally go into different stages around the same time. There may be a week or so difference, but usually week 4-5 is when preflowering/flowering begins. First 3 weeks is usually veg. For your reading pleasure: https://www.rollitup.org/auto-flowering-strains/531344-autos-life-cycle.html
.Have you tried to train the plants? I've reduced my 1 foot plants to about 7-8 inches with just a bit of LSTing. If you're growing in a confined space LSTing or SCROGing are your only options and are a must. Topping isn't really recommended with autos unless you do it early, I'm not a fan of stressing a plant out too early though. You obviously can't super crop for the same reasons.