how to use crontab on Mac to run automation testing?

1)testing_automation (a txt file in local PC, calling file : android_flow1.sh)

50 2 * * * /Users/levis.han/android_flow1.sh

2)android_flow1.sh

source /Users/levis.han/.bash_profile
robot --outputdir /Users/levis.han/Android --timestampoutputs --test AndroidFlow01 /Users/levis.han/Desktop/Work/MobileWebAutomation/TestCases/Flows_Android.robot

3) how to use crontab service on Mac

DL000xx:~ levis.han$ crontab testing_automation
DL000xx:~ levis.han$ crontab -l
50 2 * * * /Users/levis.han/android_flow1.sh