I have a python script that calls chrome via selenium with the next line.
ff = webdriver.Chrome(\'/home/user01/webScraping/CollectAndGo/chromedriver\')
on MacOS Catalina only this command worked for me
* * * * * export DISPLAY=:0 && export PATH=$PATH:/usr/local/bin && /usr/bin/python3 ~/Documents/Scripts/my_script.py