If the 1099-R has distribution code 3 in box 7, and you are below the minimum retirement age for the pension plan, then the income is supposed to go on Form 1040 line 1, not line 5. TurboTax asked you what the minimum retirement age is.
Your tax return is in the "pipeline" waiting for an IRS human to come by.
As of last status report, yours is one of 9 million returns still pending.
Worse, you might be asked to resubmit a correct tax return.