Wifi signal strength in oh-my-zsh

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I recently switched theme in oh-my-zsh to powerlevel9k while the docs cover most things the wifi signal example was Linux only so I modified it to work on MacOS (only tested on Sierra) and modified to use nerd-fonts as its not the same unicode as in the docs example.

zsh_wifi_signal(){
    local signal=$(/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I | grep CtlRSSI | awk '{print $2}')
    local color='%F{yellow}'
    [[ $signal -gt -60 ]] && color='%F{green}'
    [[ $signal -lt -70 ]] && color='%F{red}'
    echo -n "%{$color%}\uf424 %{%f%}"
}

POWERLEVEL9K_CUSTOM_WIFI_SIGNAL="zsh_wifi_signal"
POWERLEVEL9K_CUSTOM_WIFI_SIGNAL_BACKGROUND="black"

POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS=(status custom_wifi_signal load disk_usage battery)

POWERLEVEL9K_MODE='nerdfont-complete'

So with that in my .zshrc my prompt looks like this right now everything