I have not yet. He just got released from rehab. I have not even seen him yet.
Can you try to explain why you haven't told him it's over yet?
Do NOT see him. You don't need to see him to tell him it's over. In fact, doing it in person is dangerous as the most dangerous time to be around an abuser in person is when you tell them you're leaving them.
So send him a message to say the relationship is over, you're filing for divorce, that you don't want any further contact and that if he tries to contact you then you will contact the police to pursue another restraining order due to harassment. Then block him. Then call the non emergency police line and tell them exactly what you've just done, that he has form for violent behaviour, has recently been released and your children and you are afraid of him - ask them for their advice on next steps and do what they say.
Tell his family if they contact you, which they will because they will want him off their plates and onto yours, exactly the same thing. That it's over, no contact needed, divorce being filed, you won't hesitate to call the police if he comes to see you etc. And again, follow through.
You don't seem to get that you don't ever, ever, ever have to speak to him again. You don't have to have a conversation with him. He doesn't have to agree with your decision to end it.
Does any of that sound doable to you?