Are you sure you're looking at ECAS?
https://services3.cic.gc.ca/ecas/security.do
ECAS (I believe) doesn't give any information about the background check. That is usually only found in GCKey/MyCIC and requires you to create a login. ECAS can be accessed with more basic information.
Either way, it will take a while for all systems to be updated, though GCKey won't say that the application was approved until a CoPR is issued.
Good luck with the instructions, basically what you need to do is determine whether you need a visa to enter Canada or if you just need to get an eTA.
- if you need a visa, send your passport
- if you only need an eTA, send a photocopy of your passport
The letter will list the other things that the visa office is asking for. This could include
- two new photos according to specifications
- the receipt for the RPRF
- a cover letter confirming the address you want the CoPR sent to
You may also be requested to submit these things at a Visa Application Centre (VAC).
I'm sure if you have specific questions as to the requirements people here can help.