I've had a lot of experience with G 13 Labs products and think I can help.
Notice in your first picture how the largest leaves are just growing wide enough to reach the rim of the pot?
The roots grow about the same rate as the biggest leaves so that means your root system also has reached the side
of the pot. Now you will see rapid inch-a-day or better growth as the plant can now devote most it's energy into vegging.
Some folks argue your plant is right at the seedling/vegging threshold. Until the root system is fully established we don't see
much activity above ground - so you can see how that idea resonates. Anyway, you can figure your plants will grow at a
known rate and that will help you figure out how tall you want your plant to finish at. G 13 is famous for fast vegging so 2
more weeks will find them twice the size. Good time to flower, imo.
I hope your G 13 varieties include GigaBud or Blueberry Gum or their cheese. All personal favorites. However, I just started a G 13
freebie, Blue OG, and it looks like shit. Tall and scrawny, sucker better hide nex time Charlie Brown needs a Xmas tree! One of the few
bogus beans I've gotten from G 13.
BigSteve.