Panera Bread last week expanded its delivery option to customers nationwide and announced it already had hired more than 13,000 drivers to back the offering since it began testing the service approximately three years ago.

Digital sales, under which delivery revenue fall, now account for more than 30 percent of revenue for the Sunset Hills, Mo.-based restaurant company, which was acquired last year for $7.5 billion by JAB Holdings.

Panera CEO Blaine Hurst said he could see digital sales growing to account for nearly half of Paneraโ€™s sales, which last year totaled $6 billion. In some markets, such as Charlotte, N.C., where Panera first tested the service, digital orders account for about 45 percent of sales.

โ€œIn the world we live in today, digital is becoming more of an ante,โ€ he said. โ€œAt some point, all restaurants will have (delivery). Iโ€™m not sure itโ€™s an option anymore โ€” you must have it.โ€

Panera has steadily invested in its digital offerings โ€” commonly called Panera 2.0 โ€” since Hurst, a former Papa Johnโ€™s executive, joined the company in 2011 as senior vice president of technology and transformation.

Hurst said the company continues to invest resources into additional technology, such as voice ordering on smart speakers or through smart cars.

โ€œVoice is part of it,โ€ he said. โ€œBut itโ€™s also finding out and discovering ways to use information to refine menus or refine the guest experience or personalize their experience. Thatโ€™s the next generation.โ€

The number of drivers hired on a per-store basis was not disclosed, though with just less than 2,100 bakery-cafes today, it totals about six drivers per store.

โ€œDuring lunchtime, we may need eight, 10 or 12 drivers driving constantlyโ€ at certain high-volume locations, he said.

The delivery service has been operational in St. Louis, where Panera operates as St. Louis Bread Co., since last April.

Panera delivery is available for lunch and dinner orders to homes, offices, hospitals and college campuses in participating markets. The company charges a $3 delivery fee in most areas.