TurboTax gives you an estimated date for receiving your refund based on a 21 day average from your date of acceptance, but it can take longer. If it still shows processing, it just means the IRS is still reviewing your return and will post a deposit date once they are done.
The IRS issues refunds, not TurboTax. This means that we can't say for sure why you haven’t received your refund if it's been longer than 21 days since you e-filed. You'll have to speak directly to IRS to find out more about the delay. For more information, please see the FAQ link provided below:
When will I get my IRS tax refund?