Hi Anil,
My H1B max out date is 12th June 2019 but I got i-797 approval up to September 28th 2019 and even got stamped visa up to same. My Perm processing is in progress and expecting the result by May end.
I am planning to leave US by May 31st 2019 so that I still left with 13 days for max out. So my question is that once my i-140 gets approved by June/July end,is there any problem if I travel back to US before September 28 and file h1b extension in few days (within 13 days).