Med1989,
In your application everything looks like okay.
1. we are reviewing whether you meet the eligibility requirements - these phrases do not change. When eligibility is passed - you will receive a Pre-Arrival letter. Some peoples do not receive a letter, call to IRCC in ask about your eligibility.
it is possible till today?!! - yes. It is possible.
2. we are reviewing your additional documents - This is also never changing. No one will tell you about your documents were accepted or not, If they didn’t accept, IRCC will ask ADR again.
3. we are processing you background check - it is changed to "passed" before 1 day, or after receive PPR.
You AR 16 Nov 2018, your approximately PPR date - 16 May 2020. Right now federal part takes around 18 months.