I'll be that guy: they still have to fly it again. That's the real question. Incredible achievement. We got used to landing and caught boosters real quick!

This was a huge milestone, but you're right that there are a long list of future milestones: catch both on the same flight, reuse of both on a given flight, fly without significant refurbishment, fly N times in T time for many values of each, orbital refueling, crew, etc.