If you're needing your 2018 AGI to complete your e-filing, you can get that directly from the IRS using the webpage linked below. A transcript (abbreviated version) of your return can be downloaded once you set up an account. That transcript will include your 2018 AGI.
https://www.irs.gov/individuals/get-transcript
*Please click the thumbs-up icon if this response was helpful.
**Please click "Mark As Best Answer" if your question has been resolved. Thank you.
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***