At least as early as August 2023. Less than three quarters of the way through his presidency. Something that started at least 17 months ago can hardly be considered "last minute".
EDIT:
Found the answer for you since you can't be bothered (previously saw the date in some other doc reading about this):
> When was the U.S. Cyber Trust Mark program created?
>> In August 2023, the FCC sought public comment on how to create the Cyber Trust Mark program. In March 2024, based on public input, we adopted rules establishing the framework for the program.
