I have breaking news to share for the wiki about the show, so yeah I know you guys will not like it. But basically, in an interview with Den of Geek!, Ian-Jones Quartey stated that the show will be airing its series finale this year. Here is the interview he has stated it:
"What are you most excited for in OK K.O.! coming up? Obviously Sonic has happened, but what other fun stories can OK K.O.! fans look forward to?
Well now that we're through with Sonic, I'm really hoping that everybody binges, gets caught up, watches every week, and joins us for the series finale, which is gonna play later this year. It's the culmination of a lot of things that we've been working on, and it's just coming out to be a whole lot of fun. In OK K.O.! we do our big serious stories, but we always make sure that for every deep dark thing, there's like a million jokes to help you ride through. I hope everybody joins us for that."
https://www.denofgeek.com/us/tv/animation/282687/how-the-sonic-the-hedgehog-ok-ko-team-up-happened