Here is a great skyline prospective shot from
Snodrifter posted on the MW forum. Thanks, good sir! This shot was taken from the west, looking east.
As far as when this should top out, Spire has been at about a floor a week for a quite a while now. Since the building is at floor 25 of 41, I would expect to see Spire top out in four months around year's end.
About the question of two elevator cores: the building is quite long, perhaps there was enough room for multiple cars, nothing more. Or maybe one core is stairs or mechanical cars, the other for tenants. I haven't seen the blueprints so I can't say for sure.