inzwischen

уже́

since then, by now, in the meantime — contrasting between the current state and a known past state

• Tom sollte inzwischen angekommen sein.

  Tom should've arrived by now.

  Tatoeba · Pfirsichbaeumchen · CC BY 2.0 FR

• Tom müsste inzwischen dort sein.

  Tom should be there by now.

  Tatoeba · Pfirsichbaeumchen · CC BY 2.0 FR

уже́

in the meantime — at the same time as another process, typically in another location

уже́

in the meantime (at the same time as another process, typically in another location); in the meantime (specifically until the other process is finished)