According to a report, Apple's plan to release MacBook Pros with mini-LED displays has been pushed back until Q4 2021 or Q1 2022. Apparently, supply issues are to blame, but a rise in COVID infections in Taiwan may come into play, too.
https://www.notebookcheck.net/Apple-MacBook-Pro-mass-production-with-mini-LED-displays-may-be-delayed-until-Q1-2022.540009.0.html