The Broadway community breathed a sigh of relief on Wednesday night at “110 in the Shade,” the final opening night in a jam-packed couple of weeks leading up to the Tony eligibility deadline.The Roundabout revival — starring Audra McDonald, John Cullum and Steve Kazee — reps the second show from composer-lyricist team Harvey Schmidt and Tom Jones. Their Off Broadway long-runner “The Fantasticks” is playing just a few blocks away — with lyricist Jones as one of its stars. Jones cops to being a bit “exhausted” by it all, but remains undaunted. His tuner version of “Harold and Maude” will be work-shopped later this month, and he hopes to see that one in Gotham sometime soon, too. “I want to have six shows in town at once” he laughed.