According to a tip from an AT&T store employee, the iPhone 3G could go on sale at 8AM on July 11.
This is different from the original launch of the iPhone, which had the device go on sale at 6PM.
If it releases in the AM, you could potentially pick one up before work, but remember this is still just a rumor. Will you be waiting in line?
Here's Attack of the Show's coverage of the first iPhone launch:
TheBoyGeniusReport: iPhone 3G to launch at 8:00 AM on July 11th?