на полпути(Alex Lilo); в процессе(I am halfway through with this task. 4uzhoj); в середине("Apparently, halfway through the second world war, the Nazis had a secret project to build shelters for top leaders in the event of defeat – inaccessible sites in the middle of deserts, in the mountains, on a cliff or in the middle of the jungle like this," the archaeologists' team leader, Daniel Schavelzon, said. 4uzhoj); до середины("Did you watch the movies?' 'Not all yet. Half way through the first one with Ryan Reynolds." • The forecast calls for higher temperatures and lower precipitation than last summer's, and we're not even halfway through yet. -- а ещё середина лета не пройденаART Vancouver)
на полдороге(You know, I have tried and tried brioche, but I always manage to drop a stitch halfway through.)
в середине(какого-л. процесса • If you prefer using a microwave, ensure even heating by: • Cooking the berries until they are bubbling. • Stirring halfway through to eliminate cold spots where bacteria might survive. • Maintaining the boiling point for a full minute. (mpi.govt.nz)ART Vancouver)