be a heartbeat away from something
From Longman Dictionary of Contemporary Englishbe a heartbeat away from somethingbe a heartbeat away from somethingto be very close to a situation or position → heartbeatExamples from the Corpusbe a heartbeat away from something• The Red Sox are a heartbeat away from the American League championship.• The Red Sox are a heartbeat away from landing another blue-chip bullpen stopper.