You can install archy-slstatus from the AUR with your favorite AUR helper.
yay -S archy-slstatus
Or you can install the latest version from the git repository.
yay -S archy-slstatus-git
Or you can build it yourself.
git clone https://github.com/archy-linux/archy-slstatus.git
cd archy-slstatus
sudo make install clean