Regarding mental state: this study covers June 22, 2020 to the "present" (the paper is dated April 1, 2021, but I don't think it's an April Fool's joke). I suspect that people are to some extent calibrated to pre-pandemic expectations. I know I can't get things done like I could have in the Before Times, either because of mental state or because of more distractions at home than usual.

Figure 1(b) of the paper might suggest that people's estimates are worse on tasks that require flow, although I don't think there's enough data to be sure.