Implemented in #695, but I cannot give you a macOS build to test since I am not a macOS user, please build from source against my branch in order to test it locally.

On my system it shows that the path to msupdate is failing.
I'm currently getting this error using "topgrade --only msupdate".

`── 19:20:53 - Summary ──────────────────────────────────────────────────────────
msupdate: SKIPPED: Path "/Library/Application\ Support/Microsoft/MAU2.0/Microsoft\ AutoUpdate.app/Contents/MacOS/msupdate" doesn't exist

/Library/Application\ Support/Microsoft/MAU2.0/Microsoft\ AutoUpdate.app/Contents/MacOS/msupdate

ERROR: No command specified

usage: msupdate [ ...]
Commands:
-h | --help Show usage information
-c | --config Display current AutoUpdate configuration
-l | --list List available updates for installed Microsoft applications
-i | --install Download and install available updates
Modifiers:
-a | --apps Install specific application updates
-v | --version Only update to a specific version
-w | --wait Number of seconds to wait for action to complete before returning the current state of the install command
-f | --format Format output results in the specified format
p | plist Property list format
-t | --terminate Number of seconds to wait before closing opened applications in order for updates to complete
-m | --message Optional message to display on macOS banner notification to notify user
Examples:
1. List all available updates:
msupdate --list
2. Download and install all available updates:
msupdate --install
3. Download and install latest available updates for , and :
msupdate --install --apps
4. Download and install update xx.yy.YYMMDDXX:
msupdate --install --apps --version xx.yy.YYMMDDXX
5. Download and install latest available updates for and wait for seconds before closing opened applications and display on macOS banner notification to notify user
msupdate --install --apps -t -m `

This is my first try with rust, but I think it have it working right.
Let me know how I can help.

Oh, I am sorry, it is my fault

It should work now, I have fixed the wrong binary path in 842feaf

I am trying to figure out the issue, but when you run the command it just sits and waits for a response. I'm looking into this. I'll need one more day of testing to see if I can fix this. Thanks

I am trying to figure out the issue, but when you run the command it just sits and waits for a response. I'm looking into this.

Does this happen if you directly run the underlying command in your shell? i.e.,

$ /Library/Application\ Support/Microsoft/MAU2.0/Microsoft\ AutoUpdate.app/Contents/MacOS/msupdate --install

Sorry for the delay, I wanted to verify a few things first. You can official close / delete this feature request. I didn't know it at the time, but the msupdate starts a daemon and doesn't exit. This makes it a horrible canidate for topgrade to run it. Thanks for your quick work on this Pull Request.