[{"document_name":"My Document","status":[{"status_time":ISODate("2020-06-09T17:56:34.350Z"),"status_title":"Sample Title 1"},{"status_time":ISODate("2020-06-10T17:56:34.350Z"),"status_title":"Sample Title"}]},{"document_name":"My Document2","status":[{"status_time":ISODate("2020-05-09T17:56:34.350Z"),"status_title":"Sample Title 1"},{"status_time":ISODate("2020-05-10T17:56:34.350Z"),"status_title":"Sample Title"}]},{"document_name":"My Document3"}]

db.collection.aggregate([{$unwind:{path:"$status",preserveNullAndEmptyArrays:true}},{$sort:{"status.status_time":-1}},{$group:{_id:"$_id",doc:{$first:"$$ROOT"}}},{$replaceRoot:{newRoot:"$doc"}}])