System Status Report brings notification to your shell. It can automatically provide desktop notifications when long-running commands finish or it can send push notifications to your phone when a specific command finishes.
$ ntfy send test
# send a notification when the command `sleep 10` finishes
# this sends the message '"sleep 10" succeeded in 0:10 minutes'
$ ntfy done sleep 10
$ ntfy -b pushover -o user_key t0k3n send 'Pushover test!'
$ ntfy -t 'ntfy' send "Here's a custom notification title!"
$ echo -e 'backends: ["pushover"]\npushover: {"user_key": "t0k3n"}' > ~/.ntfy.yml
$ ntfy send "Pushover via config file!"
$ ntfy done --pid 6379 # pid extra
$ ntfy send ":tada: ntfy supports emoji! :100:" # emoji extra
# Enable shell integration
$ echo 'eval "$(ntfy shell-integration)"' >> ~/.bashrc