Cyrus bro same story here but mine is not consultancy, my employer tried to file H1 two times and (my luck is good as yours )didn't made it through. They have already started my GC process and my OPT expires on December this year as well, if everything goes well labor will be filed this month and without any audit( finger crossed), they will file I140/485 late october and hoping to get ead early February and GC by next april/may, hope I only have to to go School for 1 semester. F1 to OPT is possible, just of  my friend got GC a month ago from F1.