code golf for batch update in postgresql

batch_update.sql

-- this is a naive way that seems plenty fast
DO $$
DECLARE
	rec record;
BEGIN
	RAISE INFO 'Starting %', now();
	FOR rec IN SELECT id
	           FROM addresses
			   WHERE country = 'United States'
	LOOP
		UPDATE addresses SET country = 'US' WHERE id = rec.id;
 	END LOOP;
	RAISE INFO 'Finishing %', now();
END $$;

Trying to batch with a cursor doesn't seem any faster

DO $$
DECLARE
	_cur		CURSOR FOR
				SELECT id
				FROM addresses
				WHERE country = 'United States';
	ids         uuid[];
	rec			record;
BEGIN
	OPEN _cur;
	RAISE INFO 'Starting at %', clock_timestamp();
	LOOP
		ids := array[]::uuid[];
		FOR rec IN FETCH 10 FROM _cur
		LOOP
			SELECT array_append(ids, rec.id) INTO ids;
 		END LOOP;
		EXIT WHEN CARDINALITY(ids) = 0;
		UPDATE addresses SET country = 'US' WHERE id = ANY(ids);
	END LOOP;
	CLOSE _cur;
	RAISE INFO 'Done at %', clock_timestamp();
END $$;