"even though IRS website said they were mailed over a month ago ?"

Did you confirm everything yourself? And why don't you just wait a bit longer? E-filing has only been open for Two Days. On the national news, they keep having stories on USPS delivery being late. One gal last night mentioned a Dec 22 Christmas Card that just got delivered to a friend.

Stimulus info can be found at these links:

https://www.irs.gov/payments/view-your-tax-account

https://www.irs.gov/coronavirus/economic-impact-payment-information-center

https://www.irs.gov/coronavirus/get-my-payment

https://www.irs.gov/coronavirus/second-eip-faqs

https://turbotax.intuit.com/stimulus-check/

And: "The IRS said you can check the status of your second stimulus payment at IRS.gov/GetMyPayment (GMP).

If GMP reflects a direct deposit date and partial account information, then your payment is deposited there. If the payment was mailed, it may take up to three or four weeks to receive the payment. Watch your mail carefully and be sure not to throw out your payment.

If GMP shows “Payment Status #2 – Not Available,” then you will not receive a second stimulus check and instead you need to claim the Recovery Rebate Credit on your 2020 Tax Return."

Here's a link to the image for seeing the payment(s) on an account transcript image example, which you can get for them or they can get for themselves:

https://www.irsmind.com/irs-notices/irs-transcripts-now-provide-stimulus-payment-information/

Good luck.