HSAs and virtual card payments

Hi Everyone,

I have the UHC HDHP and recently used my HSA through optum bank to send a payment to my doctor's office. The payment was processed on 2/18 but it's not being reflected on my billing page at my doctor's office.

Called Optum Bank and was told they had sent a virtual card payment on the next day (2/19). It's been about 6 business days since the transaction was processed, but still no changes to my billing account.

Just wondering if this is a normal timeline or if I'm being anxious and wondering what happens if the payment is never processed by the doctor's office. Am I just out the 400 dollars?