List all the files in firebase storage date wise and zip it using cloud function

Question

I want to achieve the functionality using cloud function in javascript - I know how to list all the files from the storage and loop through it

const ref = admin.storage().bucket();
const [result] = await ref.getFiles({ prefix: `${bucketName}/` });

But I want to list all the files based on the Time in Descending order. And after doing that I want to leave only the first 5 files and zip the remaining files in the same structure as in storage and save the zip separately in my storage