That is false. Trump made his statement Saturday the 19th. Here is just one media report from the 17th saying the same thing.
Law enforcement agencies are prepping for a possible Trump indictment as early as next week NBC March 17, 2023Local, state and federal law enforcement and security agencies are preparing for the possibility that former President Donald Trump will be indicted as early as next week, according to five senior officials familiar with the preparations.
In fact numerous news outlets were saying it all last week.
Correction: Sat. the 18th