Were sooner or later?

If you say that something will happen sooner or later, you mean that it will happen at some time in the future, even though it might take a long time.

What does sooner or later mean?

: at some uncertain future time : sometime.

What is a suitable adverb for sooner or later?

Adverb. sooner or later (not comparable) (set phrase) Eventually, at some undetermined time in the not-too-distant future. He'll turn up sooner or later.

Bob Dylan - One of Us Must Know (Sooner or Later) (Official Audio)