What does 'ready to mail' mean? Do I have to do more to receive my return? I have already paid money and the deadline is almost here.

Sorry but Printed or Ready to Mail means you have to print out your return and mail it to the IRS yourself. So it has not been filed yet. How to change from Mail to Efile https://ttlc.intuit.com/replies/5561257  

Ready to mail means that you are not able to e-file your return and you will need to print and send it via the mail. See below for more information.https://ttlc.intuit.com/replies/3302152

Ready to mail means that you are not able to e-file your return and you will need to print and send it via the mail. See below for more information.https://ttlc.intuit.com/replies/3302152