So recently I had a friend of mine show me his new Switch Bundle that he purchased from an Authorized Nintendo Retailer via Ebay and within the U.S. Here are the details:
Version Number: XAW10024XXXXX
Region: US
Firmware: 3.0.1
System Color: Gray
Store: Ebay Retailer
Purchase Date: 9/23/2017
So as of now it's safe to say that US retailers will soon be stocking systems beyond firmware 3.0.0. Best Buy, Target and GameStop consoles are currently at 3.0.0 on their standalone systems. I'm unsure of retailers such as ToysRus, Amazon, Walmart, etc. The new batch of consoles, which will include Super Mario Odyssey, will most likely be at 3.0.1.