Oh, no! A month behind on a security update. That's pretty normal, as they usually come between mid-month and the end of the month. Just because they are dated the first of the month, does not mean that's when you will get them. If you have a protective app on your device (as everyone should), you shouldn't need to fret about security updates anyway. I do not believe that the security updates are pushed out by Samsung. I believe they come through your carrier the same way other updates do.
