The natural edge is great! I am by no means proficient at bowl turning, but... I suspect it will dry out even more, possibly crack, and possibly lose some of the edge. If it is not a "sealed" bowl, it will "move". Excuse me if you are an experienced turned... But, if it cracks - use a "fill" for the cracks! (Ca and sawdust; CA and colored coral; inlace, etc...) Many options to create something nice out of a "cracked" item.
This can create a beautiful piece! - so wait and see.
However... The initial effort on this project is GREAT! Time will give you more feedback that I! And your next effort in 6 months will have experience on it's side!
(I have 45, 12" long Black Walnut limbs drying. 4" - 12" in diameter. Later this year I will start to cut them up and experiment. They are seal-coated, drying slowly. Been cut for 14 months now. I still expect them to be somewhat "green" and need to dry before final turning.)
Oh... HAVE FUN!