A form 8879, IRS e-file Signature Authorization is only used by ERO's which are paid tax professional who e-file tax returns for clients.
TurboTax is tax preparation software and the tax returns filed are all self-prepared by the user of the software so there is not a Form 8879 required. There will not be a SID or MeF number.
If you e-filed your tax return using TurboTax there will be an Electronic Postmark Report which has the date/time the tax return was e-filed and the date it was accepted by the IRS, if accepted.
