White Widow-Big Bud - how big before flowering

This is my first grow.
I am using a 2x2x5 ft grow tent i paid $90, a UFO LED grow light $90 both bought on Amazon; also a 150 watt replacement CFL in a trouble lamp with reflector from a hardware store for $40. I used peat cups and miracle grow starter and Shultzes potting soil mixed with 30%MG Perilite all for $$25 at Walmart. I have an exention cord with 3 plug as i have a space heater in the basement where its and a manual power timer ($

I paid $10 for each white widow- big bud seed. I used paper towel to germinate(48 hours) and into peat cup with MG starter. 5 long days to sprout. After 8 days i transfered it into the pot In the photo. This shot is after 15 days since sprouting ( yesterday). I transfered it yesterday into a 3 gallon pail with drainage. As you can see from the second photo the plant seems happy.
I am wondering how large can I grow it before starting to flower it. I am a patient guy, I smoke very little so am in no hurry, ai would just like the best quality (not quantity though that who be bonus).
Thanks
PS I am using a ipad anfd can't attach the photo - will try other computer

Here is yesterday and today

It's up to you when to flower. Remember they double to triple In size when flipped

Is that wide as well as height?
Mine are wider than higher. I have about 3 feet up total (5 feet minus pot and light) but 2 feet wide

I would give it few weeks before to turn it into flower. I have a bigger good problem than yours and you might want to learn from it. Check my journals.

Give it another week or two, the bigger the better