... his lawyers have filed papers/challenges that put everything on hold? Just guessing. That's the way they do it, sometimes. I do think the charges and arrest should happen now, though...
No one here knows, and frankly, I don't think the vocal complaints want him to testify. They want him in jail, that's it.
Do we really believe he is going to say that trump had a meeting with racist militia groups on January 5th instructing each on where their rube members should breach the Capitol?
I suspect trump thought about it, though.