Why is my tax still processing after 24 days

There are two possible reasons.  There may be some error or question on something in your return that requires human intervention.  Or the IRS might be behind in processing due to less workers this year.  You can call the IRS and check on it.  The best time to call is 7:00 AM in your timezone.

https://ttlc.intuit.com/turbotax-support/en-us/help-article/internal-revenue-service/need-call-irs/L9DFjETxA_US_en_US

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?