How do I know if I filed already ? And when it says “ Download/print return” does that mean I’ve filed ?

Only if your e-filed return has been accepted. You can verify your e-file status here. https://turbotax.intuit.com/tax-tools/efile-status-lookup/

Please follow the instructions below to download/print your return. https://ttlc.intuit.com/replies/3301525