Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh

 

If the court has issued the divorce, then you can marry him through the nikah. If, however, he is still awaiting the judgment of the court, then I would advise you against going ahead with the nikah. We should not break the laws of the land.

As for the wali, being a mature adult, you can marry him with the consent of your wali. Their actual presence is not a requirement for the validity of the Nikah.

 

Almighty Allah knows best.