Questions & Answers about Jeśli wyjdę teraz, załatwię to przed pracą.
Wyjdę is from the verb wyjść, which is perfective. Here it means I will go out / I leave in the sense of a completed action in the future.
Polish often uses a perfective verb where English would use will + verb.
Compare:
- wychodzę = I am going out / I go out (imperfective, present)
- wyjdę = I will go out / I leave (perfective, future meaning)
In this sentence, the speaker means one completed future action: leaving now. That is why wyjdę fits better.