geoflutterfire stream to Future - flutter

Question

I have to query the geoflutterfire data with a Stream.
But I would like to use this in a Future in a ChangeNotifierprovider to be able to wait until the Stream has all data.
I never built a Future with a Stream in it before. What do I have to return?
When I don't have a return and just do notifyListeners(), the function runs forever. So I just put in return true.
Is there a better way to do this?
Future<void> fetchPlacesNearBy(double lat, double lng) async {
print("GETTING FIRESTORE PLACES");
GeoFirePoint center = geo.point(latitude: lat, longitude: lng);
double radius = 5; //in km
String field = 'geo_location';
// Reading nearby places based on lat, lng parameters
try {
Stream<List<DocumentSnapshot>> placesStream =
geo.collection(collectionRef: _placesRef).within(
center: center,
radius: radius,
field: field,
strictMode: false,
); // = false includes borderline places
await for (var doclist in placesStream) {
topWikiPlacesAroundUser2 = [];
if (doclist.length > 0) {
for (DocumentSnapshot ds in doclist) {
/// Init place model
WunderkPlace pl = WunderkPlace.fromMap(
ds.data(), ds.get('geo_location.geopoint'));
topWikiPlacesAroundUser2.add(pl);
}
} else {
print('Nearby places do not exist in the database');
}
notifyListeners();
return true;
}
} catch (e) {
print(e);
return false;
}
}