It looks like the OP is not currently volunteering as a WP was never issued so the 90 day Non-O that was issued is about to end (at least the OP should not have been volunteering without the necessary WP).
as stated above you need to start the 65k/month before you apply for this extension so that the next time you apply you will have at least 12 consecutive monthly deposits
If you are in the second month of a Non-O then it is too late to be asking about the finances for a 12 month Extension of Stay as the 800k needs to be seasoned for two months prior to application. How were you planning to get to December if you are 2 months in on a 90 day stamp?