Heya!
I don't think it is too early to start LST, some people start right at the seedling stage. Never hurts to get the rest of the plant more light right? I have done LST in both seedling and in late veg stages, all personal preference.
Good luck!
As I was told it's never too early for lst especially when growing autos you have such a short time frame, plus after a while the stock and stems get too strong to bend so early is good.