If I am not mistaken, you are using ArchLinux, am I correct?
In this link
you can find very useful information on Customizing your zsh prompt (official ArchWiki).
Also, since oh-my-zsh is a plugin and theme system for zsh and it's available in Github here
, you can download the file named oh-my-zsh.sh and tweak it a little. Hopefully you will get the desired results.
You may especially want to take a look at $(git_prompt_info) in it.
Hope this helps. If so, please mark this thread as solved, or feel free to ask any other questions you may have.