Office 2016 became end of life on 13th October 2020 - there will be no more security updates for this version of Office!.
On 18th February 2021 Microsoft announced the next version of Microsoft Office for Mac will be Office 2021.SECURITY WARNING: macOS 10.14 and earlier are no longer supported with security updates - see our securing older operating systems article.macOS 10.15 - included in the macOS 10.15.7 Combo Update + Security Update 2022-005 for Catalina.