Two Separate Electrical Services (Meters), Disconnecting One and Making Subpanel
If you have 3 insulated conductors and the messenger (support cable is aluminum) the messenger is normally the ground.
Since you have a breaker inside the house you can enter the house and go through the attic. This may be both easier and a shorter run.
Make sure you are clear of any window openings  I think it is 3’ from them.
You are well above code requirements for height  so you are good there.