You mean that if futures option ends up in the money today, it will be always assigned after its settlement for the day?
No. It's only on expiration day.
Also for the OP, as Robert said you will wind up short/long the futures contract depending on your position and which leg was in the money. Worst case scenario is that the futures contract moves hard against you before you get a chance to close it out.
I try to square most of my stuff before 3:30pm expiration day.