How do I get object metadata within a Worker for an uploaded object?

async queue(batch: MessageBatch<Error>, env: Env): Promise<void> {
  console.log('Received batch:', batch.messages);
},

{
  attempts: 1,
  body: {
    account: "",
    bucket: "",
    eventTime: "2025-04-28T19:34:47.515Z",
    action: "PutObject",
    object: {
      key: "",
      size: 3794459,
      eTag: "",
    },
  },
  timestamp: "2025-04-28T19:34:47.780Z",
  id: "",
}