API reference: https://cloud.google.com/bigquery/docs/reference/rest/v2/tables/list

The properties creationTime and expirationTime now appear in the API results for list_tables(). The creationTime properties is exposed as Table.created. A similar property needs to appear on TableListItem.

https://github.com/GoogleCloudPlatform/google-cloud-python/blob/62740078538ea84167705c15bf109c1a2737c648/bigquery/google/cloud/bigquery/table.py#L387-L397

Likewise Table.expires needs a corresponding property.

https://github.com/GoogleCloudPlatform/google-cloud-python/blob/62740078538ea84167705c15bf109c1a2737c648/bigquery/google/cloud/bigquery/table.py#L546-L556