Display minutes spent today on current domain

This is just a feature suggestion, but I personally think it helps with productivity if there is a way see at a glance how much time one has already spent on a specific website. For example https://github.com/PaulMorris/mind-the-time has this feature. Since different users might expect something different it should be optional and maybe configurable (although I'm not sure which level of configurability would make sense here).