The Business Central team is happy to confirm that you can use Office 2019 with Business Central. The system requirements have been updated accordingly. Office 2019 is available in a 32-bit version and a 64-bit version. The recommended version of Office 2019 in combination with Business Central is 32-bit, since some of the Office Integration areas in Business Central is not supported in the 64-bit version. For a full list of minimum requirements for Business Central, see the System Requirements for Dynamics 365 Business Central On-premises.