Make sure you are using the refund amount from your actual state tax return and not the combined amount Turbo Tax showed you at the end. That was for federal and state combined.
I would first verify that your return has been successfully efiled using this FAQ:
https://ttlc.intuit.com/replies/3319882
If it has, I would call the Mississippi Department of Revenue and try to speak with someone there. For some reason, your information isn't showing up in the system, so I would recommend asking a person on the line to verify that it has been received and it is processing.
Has anyone not received their state taxes on Mississippi? I filed and was accepted for both on the 28 of February and I got federal but no state.
Mississippi is experiencing a delay in processing returns due to updated security measures to combat fraudulent activity.
Please see the below statement from the Mississippi Department of Revenue:
Due to the increase in fraudulent activity, the Mississippi Department of Revenue has implemented additional procedures and safeguards into our return processes in an effort to mitigate potential fraud. These processes will validate income tax returns and credits reported prior to issuing requested refunds. As a result, these additional procedures may cause a delay in refund processing in order to ensure that the right refunds are being paid to the right taxpayers.
For information on how to track the status of your state return, see How do I track my Mississippi tax refund?