Google Analytics 4
From June 2023 Google will cease to collect and report new data from a Universal Tracking tag.
Having setup a Google Analytics 4 property and determined the GA4 tag I am in a position to make the changes to my pages. However, the new GA4 property is now receiving data from the Universal Tracking tag. This means I have over a year to make the changes.

Google are not clear on this!
Having made some changes to my tracking code it appears that Google have changed their approach to this migration.
Looking at the Google help page for this, updated December 2024, there is a statement.