There's already a similar market -- https://manifold.markets/SG/will-elon-musk-buy-twitter-this-yea -- but it's specifically about whether the deal closes in 2022. The deal does have an October 2022 deadline but I understand there's some provision for it to be extended by 6 months, to 2023 April 24. So this market has that as an end date.

UPDATE: The real question was originally meant to be "will it eventually close?" not about closing by some particular date. Of course "eventually" doesn't work for a prediction market so let's go with "by the end of 2023" as a proxy for "eventually". I have updated the close date (and now title) accordingly!