Nothing to worry about here, as you can see the exposed roots have "woodened" and have protected themselves. You can add soil but this is pretty common as plants get near the end of their cycle, most of your soil is a root sponge now anyways.
Judging from your pictures as well, I'd think you have longer than 10 days, the pistils are still "fluffy" and calyx's haven't started to swell yet.