ST. LOUIS — Schnuck Markets Inc. has added curbside pickup at 28 of its grocery stores, bringing to 59 the locations where customers can drive up to get groceries ordered via Instacart, officials said Friday.

Schnucks launched curbside pickup in partnership with Silicon Valley-based Instacart in a handful of stores a year ago, and added locations earlier this year. Now in addition to adding the service at more stores in the St. Louis and Evansville, Indiana, areas, it's launching curbside pickup in central and northern Illinois and central Missouri.

The company began working with Instacart in February 2017 to launch its grocery delivery service, which is available in all regions served by the grocer.

Customers can select a curbside pickup time between 9 a.m. and 9 p.m. when ordering groceries at schnucksdelivers.com. On completing their order, customers receive a text message with store parking information and a phone number to call when they arrive at the store. Instacart fees on curbside pickup orders are waived for Schnucks Delivers Express members, and nonmembers pay $1.99 with orders of $35 or more and $3.99 for orders of $10 to $34.99.

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“The expansion of Schnucks Curbside Pickup helps to simplify shopping for our customers and provides balance to their busy lifestyles since they can quickly order groceries from their tablet, smartphone, or desktop and have the order delivered directly to their vehicle,” Ryan Cuba, Schnucks' chief business development and transformation officer, said in a statement.

For a list of Schnucks stores offering curbside pickup, including newly added locations, go here.

Schnuck Markets has worked to remain competitive in an increasingly crowded grocery market. Among other moves, the company has added alcohol products to its delivery service, begun carrying barbecue from Sugarfire Smokehouse, added CBD products, and expanded its use of robots to give employees more time to interact with customers.

It's been a year since Schnuck Markets Inc. announced it acquired 19 Shop 'n Save stores from parent company Supervalu. The St. Louis region's largest grocery chain bought the lion's share of the Shop 'n Save brand, a local institution for 40 years, and renovated and reopened those under the Schnucks banner, growing its physical footprint by 20%.