Maybe not technically an add-on and self promotion, so please remove or let me know if it's not appreciated here. But I made a script for myself that monitors the progress of animation renders.

It monitors how many frames have been rendered, tells you the average render time per frame based on what's already rendered and gives you an estimate for when the render is done. It also (optionally) let's you know via Telegram once the render is done.

Originally I made it in batch but I remade it over the weekend in python so it's now cross-plattform. Github