Hey Mate,
As soon as the tap root shows itself, you should bring it in the soil.
And I see it's an Auto, so as less repotting as possible.
Means you should plant it in her final pot. So, yeah... go and get soil a.s.a.p. 🤣
(I would prefer a less fertilized soil, Autos do not need as much fert. in Veg. as their photoperiodic sisters)
Good luck and happy trails for the rest of the way!
Cheerz
OimRausch