Is that right? 100K daily infections give you 100,000 x 30 x 3 = 9,000,000 in three months which is 13% of 68M. Not anywhere close to herd immunity but not 1.5% either
Based on an IFR of 0.44, around 17 million already have contracted Covid. 9 million will not get us to full herd immunity, however, will reduce super spreading events (as super spreaders will already have had the disease)