Get Scheduled Hours From Assignment Work Schedules

We have a requirement to get the scheduled hours from Assignment Work Schedules.

We are trying with the below code but its not giving hours.

 SELECT *

 FROM 

 (

 TABLE(PER_AVAILABILITY_DETAILS.GET_AVAILABILITY_DETAILS

              (P_RESOURCE_TYPE        => 'ASSIGN'

               ,P_RESOURCE_ID         => '300000173930572'

               ,P_PERIOD_START        => TO_DATE('2023-07-16','YYYY-MM-DD')

               ,P_PERIOD_END         => TO_DATE('2023-07-22','YYYY-MM-DD')

               )))

It would be helpful if you can provide any inputs on this.