Reply has the Time Zone field for filtering prospects. In some cases, you might want to push prospects with/without a specific time zone into your sequence. You can quickly sort such prospects using the custom filter:
On the People page (People tab in sequence), click ADD FILTER.
In the Filter name field, enter the name for your filter (optionally).
In the Property field, select e.g. Status: Finished.
Select the True value.
Click Add property.
In the Property field, select Time Zone.
Select the Is/Is not [time zone] value (for example, UTC-08:00).
Click Save to display the results.