至此 (zhì cǐ): up until now; so far

After the meeting began, the chairperson first introduced this year's work progress; only then did the discussion formally enter the main topic.

He worked overtime for a month straight; at this point, the project finally came to an end, and he could take a few days to rest well.

The two sides negotiated for three full days, but up until now, they still have not reached any agreement.

So far, we have collected five hundred questionnaires; next, we need to analyze this data.