Can you use thus far at the end of a sentence?

The adverb idiom thus far (so far, until now) can appear wherever it sounds reasonable in relation to the modified verb or adjective.

"The prototype has been found to be completely useless thus far."

"Thus far, there is no cause for alarm."

"Life as we know it has thus far not been found on any other planet."

("Life as we know it has not been found, thus far, on any other planet.")