See no one here actually knows about the process but the adcom. Even a current student or alumni won’t be able to answer what the criteria is or when the interview invites will be sent. People on forums just make assumptions about things they have absolutely no idea about which creates unnecessary panic.
I have a friend who got an interview call 4 days before the R1 decision date.
One who got a month before decision date.
There’s no pattern and no one here can tell you what will or will not happen to you.
Posted from my mobile device