expression
now that we've come this far; after having come this far
Used when a situation has progressed to a certain point, often implying that there is no turning back or that the next step is natural. Common in both literal and figurative contexts.
ここまで来たら、最後までやり遂げよう。
Now that we've come this far, let's see it through to the end.
ここまで来たら、もう引き返せない。
Having come this far, we can't turn back now.