If you entered your 2019 income tax information in TurboTax Online, see How do I access a prior year return? Print a copy of your tax return and you'll be able to see when you e-filed it and whether it was rejected or accepted.
If you started a 2019 income tax return online but didn't finish it, see How do I finish a prior-year return that I started in TurboTax Online?
If you didn't prepare a 2019 income tax return, see How do I prepare a 2019, 2018, or 2017 tax return?