This could be neutral, just curious, or making conversation. It could also be that I am waiting for you to finish for some reason. For example, we said we would take a walk after you finish your lunch, and I am eager to go, so I ask you, have you finished yet ? b) Have you finished your sandwich already ? There could be an element of surprise here. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.