They may have even closed down at some point. Some big ones did like Fidelity, at least rumor has it. I dropped Schwab long ago, can't unfortunately get rid of Vanguard quite yet because of inherited retirement accounts, but will pop champagne the day I get rid of it.
Vanguard has been the most painful app/website experience.
Fidelity is ok, but my RH overtook Fidelity investment account in size in under a year because the ease of use. RH is many times better. Try with small amount first.

MF update is once a day after market closes. my account usually updates by 6 pm or so. your gain/earning information is not updated until the next morning.

Mutual funds prices are updated once a day at 4pm. For stocks, you should be getting real-time prices and updates to your stock portfolio valuation.

In Vanguard app, the app claims to show near realtme market prices, but when there are big market moves, the portfolio total seems to lag a day behind, but not totally. It seems that the effect seems to come in a few steps between the immediate day and the next.

Have you seen this? Do you know what's happening?
Are the mutural funds updating more slowly than stocks?