I use this little CLI utility that I wrote to send messages on Telegram via a Bot. https://github.com/simonacca/TellTg

All you have to do is `$ my_long_running_job; telltg "Done"` and you get a notification on all your devices. Very handy also for remote jobs.

The best use case so far has been piping the udev log into it when my laptop is locked in a public place and I'm away. I get a notification on my phone when someone open/closes the lid, unplugs the charger, sticks a USB drive in and so on.