Battleground Taskbar Notifier
This is a simple addon that highlights the WoW window when a battleground is ready to join. It does this by sending a whisper to yourself. This way you will not miss the battleground if you are doing other things while waiting.
Note: this has been tested with WoW Classic on Windows. Other operating systems might also work. Please let me know in the comments if it does or does not work for you!
Nothing to configure. ☺ Enable the addon to enable the notifications.