How to batch update package delays in Altium Designer?
Select all or some of your pads in the pcb (are you familiar with
Ctrl-F?).
Open the PCB List Panel (Panels button, lower right of
the Altium window).
Set the mode from View to Edit (Circled in red in
the picture below).
Find the Prop delay column.  Select the column,
Right-click -&gt; Edit (type in the new value).

Same for Pin length.

AD20.1.14