Velocity is part God-given, part trainable.
As for catching velocity, it generally doesn't matter directly. Pop times do. Actual, real pop times that are ELITE for advanced HS kids are in the 1.98 - 2.05 range with HIGH accuracy, not random throws 8 feet above the bag. An accurate 2.15 or better is very, very good for HS kids.
Velocity is part of pop time but it's far less important than mechanics, transfer, and catching ability.