If you did not need to file in 2019, then yes, the 2018 details will be used for the stimulus payment. Payments are expected to be sent for the next three weeks and will go to the most recent account information provided to the IRS.
Go directly to IRS: Economic Impact Payment Get My Payment Resource to update your details.
In the meantime, you can visit the following links for the most recent updates:
IRS: Economic Impact Payment Information Center
IRS Coronavirus Tax Relief
TurboTax Corona Virus Tax Center Updates
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