Google has full details of the Universal Analytics End-of-Life here:
https://support.google.com/analytics/answer/11583528

But to the main ask - July 1st, 2024 they will begin to disable access to the UI and the API for all users, and will begin to delete data. The full shutdown is said to happen within a week. (My guess is this will be a rolling shutdown so not all users may lose access at once - but still no reason to wait to backup your data!!)

Supermetrics will be planning the end for our Google Analytics connector as well to coincide with the shutoff. More details coming soon on our plans for that.