Why does my state refund say "ready to mail"?

Printed or Ready to Mail means you have to actually print out your tax return and mail it to the IRS or state 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.

How to efile state after federal
https://ttlc.intuit.com/community/e-file/help/how-do-i-e-file-my-state-after-i-already-filed-my-federal/00/26811

How to mail a return from the Online version
https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online/01/26258

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