What did you expect to happen?

am -U (because "AM" don't requires "sudo" to update applications, but only to install/remove them)

See the line 992 of the code.

Also, don't use the option -u (lowercased), it requires to answer a prompt, use -U instead (uppercased) to update istantly.

What actually happened?

am does not updates nothing using topgrade

Message in red "WARNING: You don't need to run the option '-u' with SUDO."

Additional Details

• Which version are you running? Topgrade 11.0.2