COVID-19 is already a top 10 cause of death in the US, and will likely be top 3 by the time it's all said and done. #3 Accidents was 169K in 2017.
Moreover, numbers 1 & 2 contain multiple distinct disease entities; #1 Heart disease includes acute coronary syndromes, heart failure, valve problems, etc. #2 Cancer encompasses every type of malignancy.
IMO, the only specific diagnosis that will be ahead of COVID-19 by year's end will be heart attacks, which killed 365K people.
Your stats are for the older generations, I assume? I found these numbers from 2014, for people aged 1 thru 44:
10 leading causes of death
1) Unintentional injury - 47,937
2) Suicide - 18,782
3) Cancer - 17,633
4) Heart disease - 15,002
5) Homicide - 11,534
6) Liver disease - 3,337
7) Diabetes - 2,919

Stroke - 2,622
9) Influenza and pneumonia - 2,080
10) Birth defects - 1,961
According to the CDC, there have been 2,426 deaths in 2020 due to COVID for people under 45, as of just a few days ago. But if you break it down further...
Under 1 year old - 5 COVID deaths = No way 5 deaths makes the top 10 list
Ages 1 thru 4 - 3 COVID deaths = No way 3 deaths makes the top 10 list
Ages 5 thru 14 - 13 COVID deaths = No way 13 deaths makes the top 10 list
Ages 15 thru 24 - 116 COVID deaths = Still nowhere near the top, but perhaps top 10 now
Ages 25 thru 34 - 640 COVID deaths = Again, not close to the top, but surely in the top 10
Ages 35 thru 44 - 1,649 COVID deaths = Not only top 10, but likely pushing top 5
So yeah, COVID will be a leading cause of death in 2020, but not necessarily for all age groups. It preys on the elderly, not the younger generations.