You can wait until 17 JUN to see your gain/loss or you can manually input your share prices for each of your positions on Schwab. Also Office 365 Excel can update your info if you track them in a spreadsheet. Office 365 Excel is able to pull info with the ticker.
Current gain/loss information may not be available on Schwab.com until June 17 for any positions formerly held at USAA. You can still find past information on your prior USAA statement, which you can access after logging into USAA.com.