@hanimmal
To be very clear, as I warmly welcome you to an honest debate, especially if you disagree, and with assurance that I can indeed be amicable:
Case fatality rate is straight forward. Take the number of confirmed, divide by the number of dead. That easy. That's CFR and it's an easy number to track.
Infection fatality rate or just "mortality rate" will still be dealing with estimates for at least several years, if not forever. Eventually we'll just have to agree on a raneg of estimates but it's got to be estimated based on science and you have to show your math. Eventually, the Case fatality rate is forgotten because it will keep changing and every epidemiologist knows that it's way off. The latest estimates are saying it's at leats an order of magnitude over-estimated.
Total infections will also be debated for a couple of years but most will form a consensus and a number will emerge in a matter of months after it stops growing. The other number that goes with this in order to estimate the mortality rate is the number of casualties. I'll tell you one thing I hate and will ask you not to do, is try to predict how many people will die. It serves no actual purpose, it's morbid, and it's just wrong. I mean, you will invariably be wrong. Do yourself a favor and do do it.