LOS ANGELES (CBS) — Grocery stores will remain open Monday, but a strike threat still looms as stores and workers negotiate a contract.

Union and company representatives will return to the bargaining table Monday after making progress over the weekend on wage rates for the next three years.

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However, no agreement has been reached on health care coverage and a contract deadline has passed.

Workers rallied late into the evening Sunday, trying to get customers on their side.

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In the event of a strike, Vons will remain open and hire temporary employees. Albertsons would close some of its stores, and Ralphs stores will close, at least temporarily.

“I usually shop at Whole Foods and Trader Joe’s and they’re not unionized, so I’ll be unaffected,” an unconcerned shopper told CBS2.

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Officials say there won’t be a strike as long as negotiations are ongoing.