Don't forget to feed softened water to the hose bibs if you will water lawn/plants.
Some feed unsoftened water to the cold on the kitchen sink. Some add a third faucet at the kitchen sink for some drinking and for house plants. Hard water is definitely better for plants. Some like the taste of hard water for drinking, and a few are on sodium restricted diets. For most, drinking that amount of salt is not significant. The salt is usually not enough to taste. If you get a reverse osmosis unit, its input should definitely be softened water.
Many (maybe most today) softener installations use a pre-made bypass unit that hooks right to the softener. In that case your 3 valves are not needed.
You also need a diaphragm pressure tank after the PRV. I think this should be before any valve that is after the PRV, but I could be mistaken on that. The purpose of that tank is both to absorb any tiny leak through the PRV and to absorb water due to the expansion of water due to heat in the water heater.
You could consider adding pressure gauges after, and maybe before, the PRV. That is not common, but gauges are fairly cheap.