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My reports only go up to the 18th so yeah they appear to be a day late as nihangshah's link mentions.
My question though is why are you guys worried about checking stats all the time when you could be working on making your sites better or building new ones? I only checked so that I could provide an answer.
Well, you can only understand why when you are a beginner. I am not a very beginner, but the reports help me see what products your visitors buy the most, and what they ignore the most. This helps you focus on the best selling product and try to promote it more. At least it is me.. By the way, the issue with reports has been fixed a while ago.