one day into flowering, add more soil? a little opinion?

Hey guys, just turned my lights back on after first twelve of darkness. Just now seeing roots come out of drain holes in bottom of 3 gallon pot. Plant is roughly 18". Should I go ahead and get some more soil to thua plant? Or is it good where it is? Just worried about root-locks.

What's root locks? Is it something like goldilocks? Lol
I add a little soil near the end of my run because they suck up so much water. And they dry out every few days. But you're not at that point yet. But yes you can add a little soil without detriment and even up pot if you think you need it. It's just cumbersome.