It can be because you paid RPRF separately.. I had paid it upfront.. also background check has been in progress for many days for me too..I almost have the same timeline. Additionally, I paid my RPRF on 27th May when they requested for it. However, acc to tracker, my eligibility has not even started yet and background check is in progress since many days now.
Why is my application delayed? Is it because I paid RPRF separately?
On the eligibility.. mine was also showing as not started when I checked yesterday.. however it was updated as completed today.. so i guess it is being done in the background and only once its done they mark as completed and you wont be seeing the in progress comment against the eligibility.. I guess paying the RPRF upfront helped but we cant say that for certain.. your eligibility should be updated soon too