How to see system status during boot instead of loading bar on MacOS

1. If you want to see the system status during boot only temporarily, press ⌘ + T during boot.

2. If you want to see the system status during boot permanently, run the following command in the terminal:

sudo nvram boot-args="-v"

3. To revert back to the default behavior, run the following command in the terminal:

sudo nvram boot-args=

References:

• https://apple.stackexchange.com/a/4235