it's early days (yet)
US /ɪts ˈɜrli deɪz (jɛt)/
UK /ɪts ˈɜrli deɪz (jɛt)/

1.
まだ早い, まだ初期段階だ
it is too soon to know how a situation will develop or end
:
•
We've only just started the project, so it's early days yet to predict its success.
プロジェクトは始まったばかりなので、成功を予測するにはまだ早い。
•
Don't worry about the results yet, it's early days.
まだ結果を心配しないで、まだ早いよ。