Apparently "Bismuth" is numbered as episodes 20 and 21, despite being a single episode, which after tonight's two gets us to 25 on Wednesday (with the 26th being the Internet shorts and extended opening, collectively, because sure, that makes sense, whatever) and the start of season 4 on Thursday, after which we get weekly episodes. Oh, Cartoon Network.
If you've seen people, including me, enthuse about Steven Universe but the first episode or two didn't grab you, here is an alternative called Flood Order, which I got from Tumblr and am extracting in a spoiler-free version here (not that there are a ton of spoilers at the link). Note that I have not personally tried this, but it seems pretty reasonable.
Start with a mad dash to the halfway point of S1 [*], which is where shit indisputably begins to get real. Because episodes are 11 minutes each, this will take you less than two hours, or in the ballpark of a feature film. The number in parenthesis is the original episode number.
If you only want to watch a single episode to get a taste, I suggest "Giant Woman," because it introduces a major worldbuilding concept and has a fun song, though Steven is a smidge annoying and there's insufficient Garnet.
I've been idly contemplating attempting to chart out the pace of the series in terms of characters and arcs, and now I want to more than ever, but I don't think my data visualization skills are up to it . . .