iTerm2 has a neat feature called a trigger, which you can use to notify you about finished maven builds (failure or success) or anything else happening in your console.
brew install terminal-notifier
Go to Profiles -> Advanced -> Triggers -> Edit
Add two new hooks
Regex Action Parameters
BUILD SUCCESS Run Commmand /usr/local/bin/terminal-notifier -message "MAVEN BUILD SUCCESS"
BUILD FAILURE Run Commmand /usr/local/bin/terminal-notifier -message "MAVEN BUILD FAILURE"