where MicrosoftEdgeBeta-84.0.522.11.pkg extracts to just .app, although there are a couple of embedded .apps, used according to the names for rendering and GPU
Office16_all_autoupdate.pkg seems to be the updater, however it seems that the updater is optional and can be chosen to not install in the installer but appears to default to install.
MicrosoftEdgeBeta-84.0.522.11.pkg Office16_all_autoupdate.pkg
where MicrosoftEdgeBeta-84.0.522.11.pkg extracts to just .app, although there are a couple of embedded .apps, used according to the names for rendering and GPU
Office16_all_autoupdate.pkg seems to be the updater, however it seems that the updater is optional and can be chosen to not install in the installer but appears to default to install.