When you requested your extension you were supposed to pay your estimated tax due. Did you enter the payment you made into your tax return? Go to Federal>Deductions and Credits>Estimates and Other Taxes Paid>Other Income Taxes
You have until October 15, 2019 to e-file your 2018 tax return. If you did not make a payment of estimated taxes when you requested your extension, then you will owe the tax due when you file the return. If you are getting a refund there is no penalty for filing after the April 15 deadline. If you owe, however, the IRS will calculate and bill you for the interest. TurboTax will not calculate it for you.
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