"so far established" is a correct and usable phrase in written English.
It means that something has been established up to a certain point or at a certain stage. Example: "The research on the effects of the new drug is still ongoing, but the benefits it has shown so far established it as a promising treatment for the disease."
"Chinese high-speed rail has so far established a mortality-risk level that equals or exceeds that of the world's safest airlines," Mr. Barnett wrote in an e-mail.
It was as though the designer had used everything he has so far established — the models gracefully walking the stage, a sense of modesty (with pants under coats and skirts).
He is satisfied with demonstrating that all we, the philosophers, have so far established, does not hold.
Direct detection using labeled proteins and indirect detection based on enzymatic assays or changes to mass, refractive index or density of a surface have been so far established.
The results so far established that lacking a birth certificate reduces the number of vaccines in children under 59 months of age.
Ethiopia has so far established several protected areas, which cover about 16.4% of the total area of the country (Tessema et al. 2010).
His No. 1 priority, so far: establishing a system to organize the 400 résumés of those staff members whose paychecks will run out in 21 days.
So far, establishing that a given workflow complies with artifact lifecycles has mostly been done through static verification, or by assuming a centralized access to all artifacts where these constraints can be monitored and enforced.
The pivotal studies conducted so far establish the efficacy and safety of bortezomib in the Caucasian population [ 10, 11].
Taken together, the four sets of challenges discussed so far establish that responsibility attributions to individuals within a group are affected both by how critical the person is perceived to be and by how close he was to being pivotal.
The answer-choice(s) read so far establish a pattern as to the format of the remaining answer-choice(s) (for example, if the first answer-choice is: "W.
