If you do not get the stimulus check automatically and do not need to file for 2019 or 2020, then you can do a non-filer's return. I do believe that you will get it automatically.
If you don't see it by January 15, the file a non-filer's return.
https://www.irs.gov/newsroom/irs-tool-to-help-non-filers-get-economic-impact-payments
