As of now Microsoft is pushing DualWrite updates to the sandbox environments and then later Production without any notice to customers and other stakeholders.The only source of information available is on this page: https://learn.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/data-entities/dual-write/whats-new-dual-write

However you need to go in and check for new updates constantly in order not to miss any update (which can easily be forgotten or not checked in time)

Therefore I suggest that Microsoft sends out notifications for the DualWrite updates well in advance, so that customers and stakeholders have a chance to test the new version. It would also be nice to have the option to pause updates if possible.