The Tax Tables can be found in this IRS document:
https://www.irs.gov/pub/irs-pdf/i1040tt.pdf
However, be aware that TurboTax often does not strictly use the Tax Tables to figure your tax. For many people, other methods have to be used. For instance, if there are any capital gains or qualified dividends, TurboTax uses the Qualified Dividends and Capital Gain Tax Worksheet. Another thing that can affect Tax Tables is Foreign Earned Income Exclusion. And there are other circumstances that require other calculation methods.
You can look in Forms Mode to see what method TurboTax used to calculate your taxes.
Go into Forms Mode and from the list of forms in the left menu column, click on the Form 1040 Worksheet (abbreviated as Form 1040 Wks) to display.
Then scroll down to between Lines 10 and 11, and you will see a Tax Smart Worksheet that indicates the tax calculation method TurboTax used.
