To verify that you have created an at job, use the atq command. The atq command confirms that at jobs belonging to jones have been submitted to the queue.
$ atq Rank Execution Date Owner Job Queue Job Name 1st Jan 8, 1997 13:25 jones 852755100.a a stdin 2nd Jan 8, 1997 19:30 jones 852777000.a a stdin 3rd Jan 11, 1997 04:00 jones 858142000.a a stdin |