Imagine that someone now wants some goods that you supply, e.g. flowers; what most people do now in a strange area is pull out their phone and do a Google search for “flowers near me" and then look at the map to review what is close to them. Now, they might be less than a block away from you, but if it is not on the map, the odds are they will be directed to someone else, a competitor, just down the road. This is the reality of today's retail world. Large numbers of your potential customers are using Google to find businesses like yours, and if you want to reach them, you need to be on Google Maps.
Mind you, they may know the area, it's just they do not know you. For example, say someone was looking for someone who does what I do. They may put "POS System near me" or Point of sale near me."
It is not hard to get yourself on Google, although it can be frustrating if something goes wrong, as I know from personal experience.
Here is a step-by-step list of how to put your business on Google Maps.
Also, if you are already listed on Google Maps, I would suggest that you check that your products and services are listed in Google Maps. For example, a florist in the above example might also sell chocolates. If so, should they register themselves as selling chocolates in Google Maps, too?