What is the Standard Operating Procedure (SOP) to get latest inventory data for all the discovered systems?

SapphireIMS by default schedules inventory collection once in 24 hours (configurable). If we need to force the inventory collection now, then navigate to Settings > Node Operations page and choose scope as Get Inventory Data. In this page, on-demand inventory collection can be posted for maximum 100 machines at a time.

There is another article on this which you may refer On-demand inventory