"Is selection of an estate tax year of 12/28/2017 to 11/30/2018 valid for date of death 12/28/2017?"
It is not valid for a 2018 Form 1041 nor for 2018 TurboTax Business.
The 2018 return (and 2018 version of TurboTax Business) is for calendar year 2018 and fiscal years
beginning in 2018 and ending in 2019. See https://www.irs.gov/instructions/i1041#idm139674712965552
For fiscal years beginning in 2017, you need to use the 2017 Form 1041 (in the 2017 version of TurboTax Business).
Note that if the estate was not required to file a return for the 2017 tax year (which appears to be the case), then there is no reason you cannot file a 1041 for the 2018 tax year (i.e., a calendar year beginning 1/1/2018).
