Quite close I should imagine. Going Gold (Unless times have changed) is sending it off to the printers for production, right? Disc burning, printing, case sleeves an whatever bits of paper will go inside. Send it off to a 24hr warehouse around lunch an you'll have made enough to stock the entire country by morning. Sit on it for a bit to ensure nothing is horrible wrong. Then a couple days to get it into the hands of stores/distributors...
As far as the digital content... I remember DICE a while ago talking about one of its patches for BF3 was ready to go, but didn't turn up for download for about a week, because of Sony/Microsoft checking it over an giving its approval for distribution. If they follow that sort of path for all digital content. A week? maybe two given the size?
So... They could in theory hold off right up until the last week of March an still be peachy.