the whole big interview homework packet is normal. they want to do all the background and PRIA checks before you are offered a job.

you complete those forms ASAP, then go for the interview. it is not a technical one, just a "tell me about a time when......." interview with a line pilot and a HR person.
then you get an "exit" interview where again you are asked "tell me about a time" questions with either a line captain or a HR person.

they will start your bacground & PRIA checks rigth away ( I don't thinkt they do your current employer PRIA until you pass the interview).

after the interview, let the process take its time, if there are any questions they will contact you, do not contact them. once all your BG & PRIA is done it goes on a pile . every few weeks the Pilot Hiring Board meets, they take those files that are completed and give you a score based on you phase 1 ( interview day) and your phase 2 ( you backgroung, PRIA, flying experience....) and you are offered a job or not.

the bad part is that it takes a while to wait for the pilot hiring board and all the BG/PRIA checks. the good thing is that everything is done when you go to training .

overall you will notice that the blue guys/gals on interview day are truly nice, not fake nice as everyother interviewer/hr person from other airlines I have interview with are. that was a nice surprise . seems like a nice company with nice people. hopefully the pay , benefits and QOL will improve and they will open more west coast bases .

have fun , is a nice interview experience. I interview in may 16, got a job offer 12 weeks later, I accepted it, no more long haul flying for me for a while.

good luck.