They look healthy, good job. This is very similar to my first grow as well.
You can look at this two ways, the first being that of experience.
You won't get a large harvest, but you will gain confidence in the process so that you might invest more into equipment in th future if you find that the responsibility and patience of growing suits you. In that scenario, I would say to likely try and flower them soon, due to the low light intensity for flower and limited space in the box. You can do this by switching the lights to a 12 on / 12 off schedule. This will help you determine if they are photoperiods or not, if they start flowering within 2-3 weeks of flipping the light cycle, you know they are photoperiods. Any bag seed that came from an auto plant isn't very likely to inherit the auto trait in great numbers.
I will add, it is important that during the 12/12 cycle, there are absolutely no light leaks into the plant area. Nothing through a crack, under the bottom, no light at all, yet you'll need to find a way to exhaust the air out of your box to avoid high humidity levels.
The second way you could do this, would be to invest in more gear. At minimum a 2x2 tent $75, a $100 or so quantum board light, interior fan $10, exhaust fan $80 and if you want to mask smell, a carbon filter $50 and then you can grow the plants larger and get a bigger harvest. But you're looking at about $300-$400 to get a little set-up going.
You can see if this is for you, or you can go all in.