The Schedule C is efiled together with all the forms and schedules in your return at one time, but all the forms have to be available first.
The Schedule C is shown to be available now. But do you happen to have any depreciation? The Form 4562 which reports a figure on Schedule C is not yet available. If you have depreciation, that can tie up your Schedule C until the Form 4562 is ready (expected date 1/25/19).
Federal Forms Availability Table for Online TurboTax:
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State Forms Availability for Online TurboTax:
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