The longer this is taking I think shows that a majority of the judges is currently against impeachment or still undecided with their decision:

The Constitutional Court’s deliberation on the motion to impeach President Yoon Suk Yeol is taking longer than expected, as more than three weeks have passed since hearings ended in late February.
Deliberations in the impeachment cases of former presidents Park Geun-hye and Roh Moo-hyun concluded within two weeks.
Although Justice Cheong Hyung-sik, who presides over the case, stressed in December a speedy ruling on the case of Yoon and his short-lived martial law imposition, the court bench has yet to announce the date for its final verdict as of press time. The court typically announces verdict dates at least two or three weekdays in advance, meaning without an announcement Wednesday, it will likely be delivered next week. (………..)
A majority opinion of at least six of eight justices is required to uphold an impeachment.
Kim Seon-taek, a professor of law at Korea University who specializes in constitutional law, said the amount of time it was taking suggested a lack of consensus among the justices.
You can read more at the link.