So how will I know if I am in Reinand?Ever since ReiNAND 3.0, Rei removed the press start screen. It automatically boots into emuNAND now.
Although, it seems like in your case you have MenuHax installed on your emuNAND (which is bound to happen when creating an emuNAND, as it is an exact copy of your sysNAND.), so ReiNAND gets redirected to HBL.
If you have a button set to skip MenuHax, press it upon seeing the ReiNAND splash screen (or maybe a few seconds before).