According to Over the Cap’s methodology (which you can read more about here), the signing of Kirk Cousins is cancelled out by the loss of Sam Bradford, because they are each expected to have a third-round compensatory value. On top of that, the signing of Sheldon Richardson is cancelled out by the loss of Jerick McKinnon, as their APY values are similar.
According to Over the Cap, the Vikings will receive a third-round pick for Keenum, a sixth-round pick for Bridgewater, and a seventh-round pick for Brock. There’s the possibility that other signings could end up pushing the compensation for Bridgewater and Brock down a bit, or that the Vikings could sign players for similar APYs that could cancel them out, but that’s where things stand right now.