A simple program to display a warning message if I have been coding for more than 90 mins

coding-timer.sh

#!/usr/bin/env bash

# add to cron tab
#  crontab -e
# then append:
#  */30 * * * * /home/kevin/coding-timer.sh

# need to have:
#  xhost local:mpromber > /dev/null
# in bashrc

# fetch the pid of my editor process
pids=($(pgrep atom))
pid=${pids[0]}

if [[ -z "$pid" ]]; then
  echo "atom proccess not found"
  exit
fi

uptime=$(ps -p "$pid" -o etimes=)
mins=$((uptime / 60))

if [[ $mins -gt 90 ]]; then
 zenity --warning --text="you've been coding for $mins minutes" --display=:0.0 
fi