Sage has announced their intent to test and support Windows 11 shortly after the expected October 5, 2021 release date. According to this KB article Sage 100 v2020.x and v2021.x should be tested and supported on Windows 11 by the end of 2021.
Sage 100 2022, which is targeted for release in March/April 2022 is also expected to work with Windows 11.
Versions of Sage 100 other than those mentioned above will not be tested with Windows 11 and will not be supported with Windows 11.
For practical purposes, we are not expecting any issues though until Windows 100 is released we cannot say for certain whether there will be updates required to Sage 100.
Sage currently supports 3 versions of their Sage 100 product. As of this writing versions 2019, 2020, and 2021 are all supported by Sage.