Dow Futures tumbled more than 500 points led by a sell-off in tech shares. Besides, Investors are monitoring progress on a vaccine for the pandemic and continued signals of support from central banks and government to support the economy. Today's markets highlight will be on the US Non-Farm Payroll if the result is outstanding may trigger the soaring of Dow Futures. However, the upside potential may be limited due to the US banks will be closed in observance of Labor Day.