In September, you're VERY likely to see all of the above and more - goats, eagles, porpoise - but it does depend on which tour you're taking (and the size of boat and experience level in the area.)
The big cruise ships (and even the large Allen Marine catamarans) tend to scare the animals off before you get a good, close view. The smaller boats have the ability to "sneak" in without disturbing the animals.
Oh, if you're interested in birds, Tracy Arm has the largest variety of sea birds anywhere in the area. September is a great month to get up close to the rocky fjord walls and see the variety of life.
Happy Alaska Travels!
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