at long last vs ultimately

at long last and ultimately both are adverbs.

Word	Noun	Adjective	Verb	Adverb
at long last	No	No	No	Yes
ultimately	No	No	No	Yes

As adverbs, at long last and ultimately are synonyms defined as:

at long last and ultimately: as the end result of a succession or process

Other synonyms of at long last include at last, finally, in the end.

at long last (adverb)	ultimately (adverb)
as the end result of a succession or process	as the end result of a succession or process