It's not uncommon for a show to recoup without announcement. I did the math and I forget how many weeks it should have taken them to recoup (estimated), but they've been generating profit for several months now.
MEAN GIRLS' weekly operating costs are probably around $700k+ per week including royalties, and that's what it grossed last week. But, there's also some money in the bank, and Tina Fey and her collaborators might be persuaded to waive their weekly royalties for a limited time if the producers have a good plan for turning around sales. (Shows often go on waivers when they're struggling at the beginning, but it's less common post-recoupment; that said, Lorne Michaels is a very persuasive man.)
Regardless, I would expect a closing in 2020 –– whether that's January, or whether they can try to improve sales to last through the end of next summer. Right now, my money is on January. 21 months is a nice healthy run for a big title that was critically-reviled.