Yes to both.  We want trees to bloom fairly closely in time.  However, in Minnesota our season is so short that almost all trees bloom within a couple weeks, plenty of time to pollinate.  Also, if there are any crab apple trees, regular or ornamental, they also serve as pollinators.  I am giving you a link on apples trees, open the drop down box on Apple Varieties recommended for Minnesota.  You will see they all ripen within a few weeks of each other.  https://extension.umn.edu/fruit/growing-apples  You also should be aware of pests and the practice of bagging apples. The apple maggot is the most common followed by the others in the second link.  https://extension.umn.edu/yard-and-garden-insects/apple-maggot       https://extension.umn.edu/yard-and-garden-news/three-key-fruit-pests-look-june

Thank you!