Breeder claims of yields are complete bs. There's no way to really estimate what your setup can produce; although it's true some strains do yield out more than others. Focus on keeping your plants healthy and green; yields will follow.
The main driver of yields is wattage; an lb off a single plant with a 450w LED is a pretty tall order even under a scrog net. Given optimal conditions you can usually expect a few zips of premium bud per plant and if you fill in every inch of netting with tight nodal growth you could get much more than that. It's not about how much time you vegged more importantly it's about how well you train your plant provided it was healthy the entire grow. The gold standard for yield efficiency is 1 gram per watt. I have yet to achieve a gram per watt myself though I've gotten fairly close. So to answer your Q I don't see how you could pull 600g but don't let that discourage you. If you are not happy with what you end up after harvesting the short answer is to upgrade your lighting.
Organic soil yields are typically not as impressive as hydro or synth nute grows at least not in the beginning but you will have a superior end product that tastes exactly like it's supposed to. Keep in mind compost teas are not like nutrients nor should they be used as such. The idea is to put mostly all of what they need in the soil and give them plain old water. You should regularly apply AACteas to maintain a high level of microbial activity which in turn will feed your plants by making the stuff in the soil available to your plants root systems. In my experience it takes a few recycles before your soil really reaches supernatural status which at that point will rival nute growers but then again ya gotta start somewhere. Check out the organic section for more info and here's a link to my thread if ya want to see how I do it:
https://www.rollitup.org/t/dick-does-dank.909077/