Hi and welcome to you and Buddy! What a nice Fathers Day gift!
I don't know anything about Exclusive food but most people on here recommend giving the puppy a few weeks at least on their current food before switching, just to try to head off any tummy trouble related to the switch. I fed both of mine Pro Plan puppy chicken & rice at the breeders' recommendation. Most on here stay away from the Savor variety because those shreds are high in soy and not necessarily the best. At his age my 2 were getting 3/4 to 1 cup of food three meals per day. I switched to 2 meals per day and adult food around 5 months but there are lots of opinions on the switch to adult food.
Again, welcome and get ready for some fun times!