I filed my return in January and asked it to be direct deposited to my checking account and I checked today and it said "ready to mail". What do I need to do?

Did you actually print and mail it yourself?  

Ready to Mail means you have to actually print out your tax return and mail it to the IRS yourself. So it has not been filed yet. And it will always say Ready to Mail. Turbo Tax doesn’t know if or when you mailed it and the IRS doesn’t update Turbo Tax when they get your mailed return. If you haven't mailed it yet you can try to switch to efile
https://ttlc.intuit.com/community/e-file/help/how-do-i-change-from-mail-to-e-file-in-turbotax-online/00/26985

When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS received the return. Don’t forget state.

Important! Mail Federal and State in separate envelopes and mail each year in separate envelopes.