They look pretty good as far as i can tell under that blurple color ( take pics under normal lighting next time ). Light might not be enough for full flower potential but since its your first grow just stay the course and get that plant to finish right.
Soon plant will sex ( meaning throw pistils) then continue to grow out .
You will see flower ( tops ) form and plant will stretch and finalize size before slowing down to build those tops. If you are letting soil feed without adding nutes thats good for now.
An alternative to feed - ( when needed ) is INSTEAD of adding nutes you may have bought .... you top dress more HF and water in. It can be that simple since .... for one .... autos do not need an extensive feed regiment, their short life EASILY FITS FEEDING FROM SOIL instead.
Watch your watering ... too easy to overwater ( common mistake) .
Especially using blurple panels as plant doesn’t transpire as fast as other more intense lighting like HPS. Space it out appropriately.
Keep ph of water to 6.3-6.5 and you are set.