For anyone else trying to determine how to switch between Chrome profiles on macOS, I found a superuser post [0]
In short you can run:
open -a "Google Chrome" --args --profile-directory=$NAME
where $NAME for your current Chrome profile can be found by looking at Profile Path in chrome://version. The last directory in Profile Path is $NAME. The default $NAME is "Default" and another profile could be "Profile 5".
[0] https://superuser.com/questions/377186/how-do-i-start-chrome...