How long does it take to get drug test results back? (Publix)?

I was interviewed at Publix last Wednesday, and they called me back to take a drug test on Friday. I don't have any fears of failing, I don't do drugs. However, how long will it take for the results to get back? It was a saliva test, not pee in a cup. Today is Tuesday, so it has been 4 business days. Considering they called me back after my interview for the test, I assume they are hiring me (The position is bagger/cart pushing) but does anyone who works at Publix know the turnaround time to when I will start training/working?