Since this cannot be listed now even with the advanced search, i have created a sql statement which lists all objects within workflows which contain an earliest starttime.
select OH_Idnr, OH_Name, JPP_Object, JPP_ErlstStTime from JPP
inner join OH on OH_Idnr = JPP_OH_Idnr
where JPP_ErlstStTime is not NULL
and JPP_Object = 'START'
and OH_Client = 'xx' >>>>> there place clientnumber
you can add this e.g. to a SQLI Vara and click "Preview" to get a list of results, if you dont want to log in to a SQL Developer or Oracle Console.