I placed two pre-orders on the 26th: one for a Z Flip5 and one for a Tab S9+. No action on the Flip5 order, but I did get return address notice from Samsung on the Tab S9+ (printed it) and a notice from FedEx that they have a package from TX in transit. Based on size and weight, I am sure it is the Tab S9+.
FedEx is showing on its tracking site that they have it in hand with shipper instruction to deliver on Aug 8.
Samsung probably had higher volume of Flip5 orders, so might be another day or two to see action on that order.