Walmart Stores Inc. (WMT) and other retailers like Amazon.com Inc. (AMZN) are still in the testing phase of same-day shipping, but Best Buy Co. (BBY) is preparing for its launch.

So take that, Walmart and Amazon, which provides next-day delivery to its Prime members.

Best Buy will begin offering same-day shipping in 40 markets by the holiday season and already offers buy online, pickup in stores at all of its locations.

On average, in-store pickup orders are fulfilled in 20 minutes, Shari Ballard, Best Buy president of multichannel retail, said at the company's investor day on Tuesday, Sept. 19. Ballard said during the busy holiday season, these orders take a bit longer, roughly one hour, to fulfill.

A Best Buy spokesman said same-day delivery orders must be made before 3 p.m. and they will be completed by 9 p.m.

At Tuesday's shareholders conference, Best Buy CFO Corie Barry said the company will expand same-day shipping to more markets as it creates new partnerships and improves its delivery capabilities. This year, Best Buy already began opening more distribution centers in denser markets and building smaller warehouses dedicated to fulfilling online orders, she said.

Ballard also said the company is trying to make its online-search process seamless, as oftentimes e-commerce shoppers who know what they want are bombarded with "a laundry list" of search results related, closely or not, to what they're after.

"I love us, so I can make fun of us a little bit," Ballard said.

Still, 50% of Best Buy's customers use both its stores and online channels, "whether they know it or not," Ballard added. When customers order online, 15% of the time, the company delivers from a nearby store, to either reduce time or costs.

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