I would think after the 48 hours it will be submitted. You can use the Where's My Refund site on the IRS to monitor the processing of your return.
Once your return is filed, TurboTax has no control over the processing of your return or the release of your refund.
Here are a couple FAQs to track your refund:
When will I get my federal tax refund?
How do I track my state refund?
Why does Where's My Refund say "approved" but TurboTax still says "accepted"?
Why do some refunds take longer than others?
What if my IRS refund is taking longer than 21 days?
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