Google Analytics setup

Google Analytics setup

So I go to my GA page and copy my tracker ID into the Settings page of Z Sites.  Is that all I have to do?  I did publish, and I don't see any action over on GA.  Does it take a day or so to register?

Also, I edited the HTML theme as well to include webmaster tools, is that advisable?  

Thanks in advance for your prompt response, have a great day!