Stand-up shouldn’t be about what was done, it’s about what will be done that day and what overlap they may have with others.
It’s also the time to communicate changes in priorities, like prod bugs or new input from customers. Usually it’s “oh, that’s probably my fault, I’ll take it,” but sometimes it’s “let’s meet after to discuss it, I’ll need people X and Y.”
And yes, most of the time it’s a waste of time, but sometimes it’s really valuable, and it’s hard to know in advance. Having the meeting can mean the difference between a prod bug getting fixed that day and not, or a dev wasting a day on a useless project because they missed an email. So we pay that cost to make sure we can catch issues and resolve problems early and quickly.