How they look and how long would take to be fully grown ?

your timeline is inline with the plants normal growth period. I find autos sart to enter bloom aorund week 4-5 the really late ones week 7-9 Then the bloom cycle lasts another 4-8 weeks depending on the strain. I think the purple one will be done faster then the none purple one. Some of the leaves on them are showing a bit of nitrogen claw so be nice to them and watch the feeds.