I haven't received my 2019 tax return or I haven't received the 2019 stimulus package

[Critter-3]

The stimulus check is an advance on a credit you can receive on your 2020 tax return.  If something went wrong or you did not get the stimulus check this year, you can get it when you file your 2020 return in early 2021—if you are eligible.It will end up on line 30 of your 2020 Form 1040.

https://www.irs.gov/newsroom/economic-impact-payment-information-center-topic-j-reconciling-on-your-...

https://www.irs.gov/coronavirus/coronavirus-tax-relief-and-economic-impact-payments-for-individuals-...

[NCperson]

in fact, if you don't receive the 2nd stimulus payment by the latter part of January, that will be reconciled on your 2020 tax return as well. 

[Critter-3]

Hot off the presses ... straight from the horse's mouth ...

https://mail.yahoo.com/d/folders/1/messages/AKaCGGNoZ5dQX-vD5Qh0EP67mQ4