I contribute to a ROTH 401K Post Tax with my employer the past 4-5 years. Should I be inputting that amount into my taxes?

Enter the amounts shown in box 12 of your W-2 only in box 12 of TurboTax's W-2 form, nowhere else in TurboTax.

Yes I notice that my final pay check Roth 401K Post-tax and W2 Box 12d (Code AA) was the same. So yes it being reported already. Thank You