Like Arathu says, if youˋre going to make brf cakes then theres no need to pre sterilize the verm, the filled pf jars will be sterilized anyways.
Iˋm using plain coir as bulk and always sterilize it in jars the day before its used and let it chill over night in the pc.
If you want to sterilize your verm/coir bulk then you can do that.
I even sterilize all peat/verm casings. People have thrown all kinds of shit at me for doing that but it works for me and Iˋll keep doing it, only had a contaminated casing once and that was over the hot days when the air is saturated with all kinds of contamination.
Wasnˋt even a lost tub, just sprayed it with peroxide while opening to kill all spores right away (to prevent spreading them) and scooped the upper layer of the case out, fruited normal after that.
So if you want to sterilize your bulk you can go for it, verm for pf cakes is unnecessary to pre sterilize