How do I enable Fedora terminal job notifications?

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That is enabled by default in Fedora workstation (Gnome).

If not, go to Settings --> Notifications and enable notifications from Terminal (or whatever terminal you are using).

Edit:

Also, you can display notifications from scripts or large downloads (wget) that you may be running (and that take a while to finish). The simple command notify-send text will display text in a notification. For more info: notify-send --help.

One thing I like if I don't want get distracted by all the notifications my system wants to display is the extension Do not disturb from Gnome extensions. Simply mute all notifications.