Where can I find my estimated refund date in turbo tax

Turbotax doesn't supply that information.  You have to go to www.irs.gov 

You are able to track the progress of your return via the IRS Where's My Refund? site after your Federal return has been accepted by the IRS. That is where you will find the most up-to-date information regarding the status of your tax return and a specific date of when to expect your refund. 
For additional information, please see the TurboTax FAQ When will I get my IRS refund?
To track the progress of your state tax return, see the TurboTax FAQ How do I track my state refund?
Please note, if you claimed the Earned Income Tax Credit (EITC) or the Additional Child Tax Credit (ACTC) there will be a delay in processing your tax return.
Please see the TurboTax FAQ: Some 2019 federal refunds are delayed due to the PATH Act for more information.