What do we think the final height (inclusive of the wings) will be - around the crane cab in the last photo?
I think the taller fin will end up close to the crane cab. From what I can tell the current steel is probably for that inner cylinder right at the top, and the higher fin seems to extend about 4 floors above that point.
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You can really see here how bit that fin is compared to the rest of the normal floors.
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I hope you're right and I'm wrong!
This construction staging video on You Tube could answer some questions.
4d Construction sequence of Bulfinch Crossing, Boston, MA - YouTube