How can the funds bought in the bank query the market in real time? Can I only sell it at the bank?
You can never find the market price of these things that the bank bought at that time, only the next day. You can find it online or in the bank. It's the first day's price. There was no market price at that time, but it was a price every day. This is the difference from closed-end funds. If you buy a bank's fund, all institutions under this bank can buy and sell, so you don't have to go to the bank where you open an account. If it is a new fund, it needs to be closed before it can be discovered.