macOS by default does not have Bash autocomplete feature at the terminal by default as Linux distributions like Ubuntu does. To enable it, you will have to install and enable bash-completion program for macOS which is available via Homebrew.
bash-completion can be installed and enabled in macOS from the terminal.
$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
$ brew install bash-completion
$ . /usr/local/etc/bash_completion
[ -f /usr/local/etc/bash_completion ] && . /usr/local/etc/bash_completion
Comment anonymously. Login not required.