The phrase "not yet" is often used to indicate that something has not happened or been achieved, but is expected to at some point in the future. There are a variety of synonyms for this phrase that can be used to convey the same meaning, such as "still pending," "in the works," "not completed," "unfinished," "being worked on," "in progress," or "yet to be done." These phrases convey the sense that something is in the process of being accomplished, but has not reached its desired end point. The use of different synonyms for "not yet" can help to add variety and nuance to your writing, making it more engaging and effective.