Google Maps and uploading CSV

I’m trying to set up a store locator for a client, but they have hundreds of stores across the country. Is there any map plug in that lets me upload an excel file with store locations instead of manually uploading each individual store location? It would take hours to do -_-

I’ve seen the option available in the plug in simplemaps, but it doesn’t seem to be working. Just gets stuck on the “upload CSV” page.

Thanks