Tribalelder...
No particular time. Big flocks in the late afternoon/early evening and they perch on the electric wires for a while.
We took the pics last year when we had electric wires running over our land so they were very close. Have seen them on nearby wires most evenings but you'd need a good zoom lense.
If you want to come up some day let us know and as we have wires at the front and back of the house you might get lucky enough to get a picture
Cheers
Fi