Why is the incision not closed, bone graft exposed? (photo)

I recently had a wisdom tooth and molar 18 extracted. Bone graft put in place 9 days ago. I’m doing ok on pain level it’s just a little sore but as some stitches have dissolved, I’m seeing some bone graft material and the gums don’t seem to be closing. Will they close? Is this an isssue? Finished al antibiotics as well.