[{"_id":{"day":2,"year":2021},"total_minutes":11},{"_id":{"day":3,"year":2021},"total_minutes":1},{"_id":{"day":26,"year":2020},"total_minutes":1},{"_id":{"day":27,"year":2020},"total_minutes":3},]

db.collection.aggregate([{$sort:{"_id.year":1,"_id.day":1}}])