Its my first time making beef tallow, am i doing it correctly?

Heres my setup:

Beef Suet/Fat minced since i dont have a grinder

Cooked slowly with coco charcoal briquettes

Im cooking it for atleast 4 hours now but it doesnt have the "cracklings" yet, im not sure if the temperature is not enough or it needs more time.

Can you please shed some guidance to how to make it correctly?

Heres how it looks at the moment https://imgur.com/a/jrwCTyX