So Far
WordNet
adverb
(1) Used in negative statement to describe a situation that has existed up to this point or up to the present time
"So far he hasn't called"
"The sun isn't up yet"
(2) Used after a superlative
"This is the best so far"
"The largest drug bust yet"
(3) To the degree or extent that
"Insofar as it can be ascertained, the horse lung is comparable to that of man"
"So far as it is reasonably practical he should practice restraint"