Barely. Only 3 out of 338.
https://www.fangraphs.com/leaders.aspx?pos=all&stats=pit&lg=all&qual=30&type=22&season=2018&month=0&season1=2018&ind=0&team=0&rost=0&age=0&filter=&players=0&sort=11,a
Though the average number of pitches per game is 288, so the actual overall reduction in game time if actually enforced would be 20 minutes. And that's assuming they are exactly 20 seconds. It would probably be a second or two less if they didn't want to get penalized.
Baseball games would then average roughly 2 and /2 hours. That's on par with hockey and close to basketball.
What's interesting to consider is how it would affect hitters. Lots of guys step out, and JDM, as much as we love him, takes 27 seconds in between pitches. Maybe he and other pokey hitters spend that time trying to figure out how the pitcher will work them.
Of course, who knows if this will actually be strictly enforced by late May.
The players union needs to understand that it will ultimately benefit them. If it is a better product, that results in higher ratings which is more money (in theory) for everyone.