How to get Transaction Timestamp ?

Can we get the transaction timestamp for INSERT/UPDATE/DELETE ran against table in the database ?

postgres=# create table trx_test(id int, name char(30));

CREATE TABLE

postgres=# insert into trx_test VALUES (1,'AAA');

INSERT 0 1

postgres=# insert into trx_test VALUES (2,'BBB');

INSERT 0 1

postgres=# insert into trx_test VALUES (3,'CCC');

INSERT 0 1

postgres=# select xmin,* from trx_test ;

  xmin   | id |              name

---------+----+--------------------------------

 1348711 |  1 | AAA

 1348712 |  2 | BBB

 1348713 |  3 | CCC

(3 rows)