Database
[{_id:"123",updatedAt:ISODate("2023-03-02T14:04:37.925+00:00"),embedded:[{_id:"456",updatedAt:ISODate("2023-04-02T14:04:37.925+00:00")},{_id:"789",updatedAt:ISODate("2023-04-10T14:04:37.925+00:00")}]}]
Query
db.collection.aggregate([{$set:{embedded:[{$first:{$sortArray:{input:"$embedded",sortBy:{updatedAt:-1}}}}]}}])