How to find out the execution time of an aggregation query at the mongoose db level?

Question

MongoDB

I am writing a query that groups data through Mongoose, how can I find out the query execution time at the database level?

Student.aggregate([
{$lookup:{
from:"groups",
localField:"group",
foreignField:"_id",
as: "group"
}},
{$unwind: "$group"},
{$group: { _id: {groupnum:"$group.num", passnum:"$passport.num"}, count:{$sum:1} }}
])

.explain("executionStats") doesn't work

here to learn time of performance of this request?