The last (DOJ) IG report was titled: “A Review of Various Actions by the Federal Bureau of Investigation and Department of Justice in Advance of the 2016 Election”
It’s not everything to do with the pre-election period (FISA shenanigans, PPdossier, and campaign infiltration not covered); neither does it cover subsequent events (more FISA shenanigans, at a minimum).
I’m not sure we even know how many of these reports to expect.