thanks alot for your help.You will get your OWP by the time your status expires, most likely. It's not necessary to send the extension status 30 days in advance. If your status expires Dec 24, you need to send in the extension request by that day and yes, it gives implied status.
You can easily wait til late Dec and, honestly, even if you don't get the OWP by then, I've never seen a case of an OWP application returned past two - two and a half months, not to mention four.
So I just wait until end of Dêc. I hope I would get OWP before expired day of 24Dec.