You can list all collections in a project by calling client.collections().list(). Listing all collections in a project is as easy as: 
collections = client.collections().list()
The list() function returns a list of Collection objects: 
for collection in collections:
    print(f"Collection name: {collection.name}")
    print(f"Organization ID: {collection.org_id}")
    print(f"Project ID: {collection.project_id}")
    print(f"Region: {collection.region}")
    print(f"Schema: {collection.schema}")