When 2019 TurboTax asks if you if you have an excess contribution, it's asking if you had an excess contribution subject to penalty in 2018 that you carried into 2019.
TurboTax will accept your entry of any amount that you tell TurboTax that you contributed for 2019; enter whatever amount you actually contributed or anticipate contributing. TurboTax determines your 2019 excess Roth IRA contribution from your filing status, MAGI and the amount that you contributed to Roth IRAs for 2019. If any portion of your Roth IRA contributions made for 2019 is an excess contribution, TurboTax will inform you of that as you proceed through the entry steps. If TurboTax tells you that some amount of an anticipated Roth IRA contribution (that you have not yet made) is an excess contribution, simply go back and reduce the amount that you entered as your Roth IRA contribution. [Edit: I see that you have now done that.]
Since you appear to be using the CD/download version of TurboTax, you can also switch to forms mode and view the Roth IRA Contribution Limit Worksheet or view Form 5329 Part IV.
