You can check the status of your Federal refund through the IRS Where's My Refund tool:  IRS -- Where's My Refund?

See the following TurboTax article for more information:  Where's My Tax Refund:  How to check your refund status

If your return has been accepted by the IRS, only the IRS can give you further information about why you have not received your refund.  

@Mandy13

Same here! I mailed mine in middle of feburary after paying $80 freaking dollars and it just says processing with no return date! Cant get ahold of IRS to save my life! This is BS having to wait with no answers on why! 🤬

@BabsBR

Once your return has been accepted by the IRS, the refund process is completely under the control of the IRS. The IRS says that most refunds would be issued within 21 days. But some returns need more processing and refunds will take longer, especially during these Covid-19 times when some IRS agents still work remotely.

Please read this IRS FAQ for more information.

Please be patient, the situation will get better soon as some IRS agents are returning to their desks. You can check the status of your refund at this IRS web portal.