It is so large that it being released in parts. The first part, which focuses on Hillary's emails, has already been sent to the FBI and DOJ for review. They can take about two weeks to write a rebuttal if they wish to claim there are errors. Then it will be released publically. I don't know about the other sections, but they should follow shortly.
I am sure the IG has copies of the report. Maybe they are required to send it to those scum bags, who would probably destroy it, if they could. What a bunch of scum bags. 😁 OK, its kind of tongue in cheek, but they really ARE a bunch of scum bags.