Expect it to take 2-4 months before progress is made.  The hiring process includes a thorough review of your application/resume, security background check, and evaluating your skills/experience against other applicants who applied for the same job you did.  You may or may not be required to come in for an interview and/or polygraph exam.  Some federal agencies send rejection letters, others do not, so don't be overly concerned at this early stage.