You can start LST now if you want just bend her over ;) Though personally it all depends on what space you have I'm a fan of just letting plants go leaving them to it and just feeding and usually I get some good results training methods are cool but I prefer a nice phat main cola and then the smaller nugs too its all down to personal preferance what kind of set up and space you have personally if i am training I will wait until the plant is ready to flower about 7 nodes up and then I bend it over at the base of the main stem and let it go for two more weeks trying to build a canopy with side branching rather than a normal plant but this is rare I find any stress you cause your lady will slow her down and with a DWC system thats not something I want as I want to finish plants as soon as possible so more can go in hence the DWC :) Though do what you want bro this is you plant. Best of luck and keep it green :) 👊