home straight

noun

horse racing the section of a racecourse forming the approach to the finish
the final stage of an undertaking or journey

Also (chiefly US): home stretch

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012