At-last Definition

phrase

(idiomatic) After a long time; eventually.

Now that the dog has stopped barking, perhaps we can at last get some rest. After three hundred years had passed, at last the vampire's soul was free.

Wiktionary

(idiomatic) In the end; finally; ultimately.

After all their troubles, at last they lived happily ever after. After exhausting all possibilities, Holmes was at last satisfied the problem was unsolvable.

Wiktionary