How to get Bash version number in OS X

Following command can be used to know the bash version in Mac OS.
Execute the following command to know the bash version.
bash --version
When I execute the above command I get the followings.

GNU bash, version 3.2.57(1)-release (arm64-apple-darwin21)
Copyright (C) 2007 Free Software Foundation, Inc.

Image showing the command and it's output.

Apple's #WWDC2019 (Worldwide Developers Conference) was held on June 3-7.
Details of the cool announcements  can be found here

macOS's next big upgrade will be called Catalina and with it comes a big change for developers.
Catalina macOS

By default macOS has used bash as the default shell. New user accounts in macOS Catalina will use zsh. Zsh is an open source shell very popular and comes with a ton of features.

Zsh Shell

Zsh git repository link is

Apple support page contains details about how to set the Zsh shell as default for macOS Mojave and earlier