US Postal Service PSE Mail Processing Clerk interview questions

I applied the 27th of July. Received an email for a scheduled interview the 20th of August. Had a great interview. Was asked no interview questions, the supervisor just explained the role of the position. Upon close of the interview, the supervisor let me know I'd be expecting an email regarding invitation for drug screening and a background check. I received the email the 26th and completed the steps instructed. At this time I am waiting for the result and will be scheduled for drug screening once that his shown clear.