Yes, investors can know the ups and downs of the fund on the day by looking at the net worth estimate. The net value estimate is the estimated net value of the fund on that day, which may deviate from the final published net value, but the deviation will not be great.

The fund's ups and downs will not be updated until the next day. Funds calculate income according to the rise and fall of net worth. The net value of the fund will generally be updated after the stock is closed. The stock liquidation time is from 6 pm to 10 on the trading day, and the income can only be calculated after the net value of the fund comes out, so the fund income can generally be updated the next day.