SQL> 
select banner from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
create global temporary table dropme_gtt( id number ) on commit delete rows;

Table created

alter session set temp_undo_enabled = true;

Session altered

insert into dropme_gtt
select level as id from dual connect by level < 1000000;

999999 rows inserted

select value from v$parameter where name = 'temp_undo_enabled';

VALUE
--------------------------------------------------------------------------------
TRUE
select t.begin_time  from v$tempundostat t WHERE  end_time >= SYSDATE - INTERVAL '1' MINUTE;

BEGIN_TIME
-----------
drop table dropme_gtt;

Table dropped