Everyone is just guessing at this point.
Look, we now know that someone in the USA died from this on February 6. The average time from catching this and dying is 3 weeks. And, this person did not travel to China. So she got it via community spread sometime in early-mid January. Meaning, it was already in the USA likely in December, BEFORE China even identified the virus (January 7).
So we don't even know the full spread of the virus at this point because it's been spreading longer than we think.
All these numbers are based on bad data. We don't know how many cases there. We don't know how many people are carrying it. We don't know how many have died (although this is probably the one number that is mostly correct).
Look what they were saying on January 4 about the flu:
"The current flu season is on track to be one of the worst in years, Director of the National Institute of Allergies and Infectious Diseases Dr. Anthony Fauci told CNN. CNN reports that Fauci says the 2019-2020 flu season is on track to be as severe as the 2017-2018 season, which was the deadliest in at least a decade. New data from the CDC released on Friday estimates that so far this season, at least 6.4 million people have caught the flu, 55,000 people have been hospitalized and 2,900 people have died — 800 more people then were estimated the week before."
Guess what? A bunch of those early flu deaths were actually COVID-19. They just didn't know it because they didn't know it was out there, or didn't test people because they hadn't traveled.