There is no benefit to filing before the end of January or before you get all your tax reporting forms. If you do your return is simply will be put on hold until they can verify the income you reported with the tax forms that are issued and you run the risk of having to amend the return (amendments are currently taking upwards of 8 months to process... so being hasty is not the wise choice).
And you will be surprised that the stores usually have the program before the "advantage" folks get them AND remember the IRS never accepts efiled returns prior to mid January. AND remember the program itself will not be fully functional until mid to late January at the earliest ... later for the state functions so please don't be in a rush.
