Either 1) or 4) sounds fine. 4) sounds better than 1).
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The more idiomatic pattern is to use a perfect tense with a "by the time" clause with implications of an expected future achievement. You need 4).
By the time the project concludes this fall, he will have traveled to 15 cities.
By the time the playoffs arrive, United will have played a team-record 47 games.
By the time the sale is made, the Wrigley Field ivy w