There's nothing you have to do right now. "Finalized" would mean the forms in your return are all ready to be e-filed and, this early in the year, there are still a few forms, especially in the states, that are not final yet. We'll send you an e-mail when your forms are final and you can return to select that form of payment and file your return then.
Keep in mind that any returns filed with us now will have to be held until the IRS begins accepting them on 1/23, so there's still plenty time to finish up your return and still be an early filer.