With the labor shortage it is maybe a 50/50 chance of finding it open. The slower the traffic in the store probably makes for better odds.
i don't believe they have a set number of hours of operation! (like they're supose too) There have been weekdays they were not open at any point throughout the whole day. Usually, your best bet is to try and arrive as early as you can, because if they are open they will only be open until 3-4ish in the afternoon. Basically they make up the hours they want and it seems to be closed more than not.
According to their website the Napa Walmart "Money Center" hours of operation are 6AM–11PM
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