Ready to mail means you selected to mail the tax return to your state. If you intend to print and mail your state return the processing times vary from state to state.
Please see this for more information: https://ttlc.intuit.com/community/refund-status/help/how-do-i-track-my-state-refund/00/25571
If you are eligible it typically is quicker and your refund processing happens faster if you e-file. You can change to e-file by following these steps: https://ttlc.intuit.com/community/e-file/help/how-do-i-change-from-mail-to-e-file-in-turbotax-onlin...
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