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No, it doesn't. The find us map only shows that there will be a supercharger somewhere in the Salisbury area. The place where the grey pins go on Tesla's map is on the city name, not the actual future location of the supercharger. Once the supercharger is active the red pin will be placed in the exact location.
As mentioned, the Find Us map doesn't show exact locations of upcoming Superchargers. With very rare exception (sometimes turnpike travel plazas), upcoming locations are centered on the city name on the map.
Yes same price, in MD we pay per kWh delivered and not based on time or rate of delivery. You can see the prices by tapping the superchargers on the screen in your car.