This is always a planned date. The actual release can always change due to issues found in testing the releases.
Most of the time, MR's and MP's are released on the planned date, or even a few days earlier. But the date is never guaranteed! Like said, if issues are found, the release date can be prosponed without prior notice.
Besides all this, it's always wise to test an update on a test server first, before deploying it on the production server. But I can understand that not everyone, has the resources to do so.
Please take some margins on the release date.
Thank you very much for the update,
We do test it on our Dev & QA servers prior to the Production release.
I moved the release date by 2nd Week after the release of MR, considering testing and updates on the production server.