Yes it is. It sets a time before which something will not, cannot, or did not occur.
Yes, after is an adverb of time.
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yes finally is a adverb of time.
Yes, currently is an adverb. It means presently, at the current time.
Yes, it is an adverb of time. It can rarely be an noun or adjective, as well as a conjunction.
As an adverb, longest describes time and modifies a verb. For example, "He slept longest."
It can be either. It is much more commonly an adverb in questions (When will we leave?) As a conjunction, it connects clauses of time (When you get there, call me).