Earlier this week eBay formally launched its same-day delivery service eBay Now, and now it looks like the United States Postal Service itself might want to get in on the action. In a notice filed today with the Postal Regulatory Commission, the USPS stated that it planned to trial a same-day delivery service of its own called Metro Post. The trial, which will begin November 12th — Bloomberg reports it will take place in San Francisco — will see the USPS partnering with up to 10 online companies and their respective retail partners. Participants will be able to purchase products in three different ways: from one of the partnered e-commerce platforms, from a retail store itself, or on the website of one of the companies partaking in the service. If a purchase is made before the afternoon cut-off — 3PM is the latest time one will be able to order products — it will then be delivered to the buyer's home between 4PM and 8PM that same day.