Too late to top these autos? I'm at the end of 3rd week.

Yeah like the other guys said - LST is your friend with autos and its time ti get started asap.

Going off previous comment but more detailed. Topping autos will not only stresss them out but will most likely cause them to flower which is the last thing you want from a plant your size right now. Use lst to even out your canopy instead of any kind of hard stress training(topping, super cropping, hard super cropping,ect.) On another note those pistols you zoomed on don’t technically signify flower could and likely Is pre sex if your plant is that size. Best of luck.💚✌️🏼

No topping autos isn’t the best thing to do. With such a short vegetative period it’s not worth stressing the plant out. You don’t have the time to recover like a photo. I mean it’s your plant there are no rules to say you can't but I personally would stick to LST with an autoflower.