FirebaseFirestore - Snapshot with 'where'

Does anyone have a example for using the 'where' in the snapshot for FirebaseFirestore?

As I want to listen to the documents where one of the fields are equal to a specific email.

This I want then to use to update my Scaffold to display the current settings.

import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';

class Test2 extends StatelessWidget {
  const Test2({Key? key}) : super(key: key);
  static const String id = 'test_2';

  final TextEditingController _deviceName = TextEditingController();
  final TextEditingController _onHour = TextEditingController();

  @override

  var firebaseUser = FirebaseAuth.instance.currentUser?.email;
  final CollectionReference _device =
  FirebaseFirestore.instance.collection('devices').where('email', isEqualTo: '$firebaseUser') as CollectionReference<Object?>;
  
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(leading: null,
          actions: [
            IconButton(
                onPressed: () {},
                icon: Icon(Icons.close))
          ],
          title: const Text('Device Selection page'),),
        body: StreamBuilder(
          stream: _device.snapshots(),
          builder: (context, AsyncSnapshot<QuerySnapshot> streamSnapshot) {
            if (streamSnapshot.hasData) {
              return ListView.builder(
                itemCount: streamSnapshot.data!.docs.length,
                itemBuilder: (context, index) {
                  final DocumentSnapshot documentSnapshot = streamSnapshot.data!
                      .docs[index];
                  return Card(
                    margin: const EdgeInsets.all(10),
                    child: ListTile(
                      title: Text(documentSnapshot['deviceName']),
                      subtitle: Text(documentSnapshot['startHour'].toString()),
                      trailing: SizedBox(
                        width: 100,
                        child: Row(
                          children: [IconButton(
                              onPressed: () {}, icon: const Icon(Icons.edit)),
                            IconButton(onPressed: () {},
                                icon: const Icon(Icons.delete))
                          ],
                        ),
                      ),
                    ),
                  );
                },);
            };
            return Container(
              child: Row(
                children: [Text('Test')],
              ),
            );
          },
        )
    );
  }
}