Here's the official reporting schedule. The first dates are the Testing Dates with the two lines after each set of dates representing the start & close date of reporting. The NBME states that most people will hear at the beginning of the reporting period, but not all! Hope this helps.
Step 2 CS 2006 Reporting Schedule
Jan 1 through Feb 25
Mar 29
Apr 26
Feb 26 through Apr 22
May 24
Jun 21
Apr 23 through May 20
Jun 21
Jul 19
May 21 through Jul 15
Aug 16
Sep 13
Jul 16 through Sep 9
Oct 11
Nov 8
Sep 10 through Nov 4
Dec 6
Jan 3, 2007
Nov 5 through Dec 31
Jan 31, 2007
Feb 21, 2007