Wow, cool picture!
You really can never know if he is finished molting, you should cover that area of the glass w/ opaque tape or paper to prevent bothering him during molting. They need dark to molt. My crab parted te substrate about a month ago, and I thought he was done molting (he was digging around). It has been a month since then w/ no sign of him. I recommend covering the glass, just in case, he might have a bit to go, whether recovery or finishing molting.
![Smile :)](./images/smilies/icon_smile.gif)
Good luck!