i haven't filed since ‘16
Nvm
For the 2020 stimulus check, they would be based on 2018 tax returns, although the Senate bill contains a provision that a 2019 return could be used if you did not file a return for the 2018 tax year. (That’s a good reason, if you had income in 2019, but not 2018—say you’re a new college graduate—to get your 2019 return filed.)
You should still be good if you file for 2019.