If you ordered a Nexus 6P, this one's for you. According to various reports across Twitter, Google+, and Reddit, many Nexus 6P orders are shipping this afternoon. From the looks of it (and that includes at least two different Reddit threads), those who ordered the 32 GB aluminum model are getting first dibs...
If you're one of the lucky few who have a phone shipping this afternoon and you ordered with overnight shipping, you'll probably see your phone at your doorstep on Monday. The rest of of the Nexus 6P variants — assuming you ordered on launch day — will likely begin shipping out sometime next week.