Simple answer, for a simple question:
will mysq Workbench be on debian10 busterAs you can see here, mysql-workbench has been removed from Debian buster due to a release-critical bug that the maintainer has forwarded ...
It does not look like there are any plans of including in Debian 10, all though it is available for Debian Sid, and still will be.
If my simple answer is not good enough, read some of the search results, and see for your self.