By that late in the season I'd expect that entire affected part to be dead but the distance picture looks right. You should be able to follow TBD branch back and find the end of the canker and prune it beyond that point.
Fruit trees in town are a pain.
Yes, they get fire blight, was pretty bad here this year. Need traps for coddling moth and apple maggot that should be monitored weekly through the growing season so that you know when to spray. A spray at the wrong time is useless
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