After purchase, you can calculate the profit and loss from the next day. For example, if you subscribe at 1 and confirm the transaction on the 2nd, then the profit and loss of the fund subscribed by 1 can be calculated from the net value after the closing on the 2nd night.
If you shop on Friday, you can calculate the profit and loss next Monday, because holidays are not working days and rest days. Even if the money fund is profitable, it won't be known until Monday.