I also started the SPG AMEX card this year, and all of my bonus points were posted on the same day (in this case back in April).

SPG AMEX CC STAY BONUS POINTS Apr 06, 2004 +500
SPG AMEX CC STAY BONUS POINTS Apr 06, 2004 +500
SPG AMEX CC STAY BONUS POINTS Apr 06, 2004 +500
SPG AMEX CC STAY BONUS POINTS Apr 06, 2004 +500
SPG AMEX CC STAY BONUS POINTS Apr 06, 2004 +500
SPG AMEX CC STAY BONUS POINTS Apr 06, 2004 +500
SPG AMEX CC STAY BONUS POINTS Apr 06, 2004 +500
SPG AMEX CC STAY BONUS POINTS Apr 06, 2004 +500
SPG AMEX CC STAY BONUS POINTS Apr 06, 2004 +500
SPG AMEX CC STAY BONUS POINTS Apr 06, 2004 +500
SPG AMEX CC STAY BONUS POINTS Apr 06, 2004 +1,000

Dunno, but they did make it.