Sentence examples for so far has from inspiring English sources

"so far has" is a correct and usable phrase in written English.
It is often used in sentences to indicate the extent of progress or accomplishment that has been made up to a certain point in time. Example: So far, our project has been going according to plan. In this sentence, "so far has" is used to show that progress has been made on the project up to the present moment in time. Another example: The athlete's training has been rigorous, but she has so far managed to stay injury-free. In this sentence, "so far has" is used to show that the athlete has not been injured up to this point in her training.