To access your current or prior year online tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/
Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show. Click on 2018
The status of the federal tax return will be shown. If the status is Accepted then the federal tax return was e-filed and received by the IRS.