Looks ready to me.
Clay said:
Forget the pot—plant it along your yard’s border and start a mojito battle with your neighbors!
That’s next-level thinking! If I could award you, I would, but I’m broke 
.
Plant it now.
You should’ve done it yesterday!
Those roots are ready for some soil action.
You can plant them now, or even earlier when the roots first appeared. If you need more prep time, the plant will keep growing roots in water for about two weeks before it starts using up its reserves.
Also, the roots growing high up isn’t unusual—it’s part of the plant’s natural response to growth hormones collecting at the nodes. You might’ve seen roots growing from the leaf nodes, which is why it’s good to remove lower leaves to encourage rooting.
@Jai
Wow, this is great info! Thank you so much. I’ve got pots and soil ready, so I’m planting today. I can’t wait to grow my mint!
They look good to go!
Now is the time! Also, consider using some mycorrhizal powder to boost root growth—it works wonders, especially on soft-stem plants.
Roots showing? That means it’s ready for soil.
You can plant it now, but I like letting them bulk up a bit more in water first. They grow fine that way too.
Is that mint? Just throw it on the ground—it’ll grow!