Can I unplug my BitBox02 while I'm waiting for a transaction to confirm?

Your BitBox02 is not needed to be plugged in in order to receive a transaction. While you are waiting for your transaction to confirm you can quit the BitBoxApp and unplug your BitBox02.

As long as you have confirmed the received address on your BitBox02 display, any transaction sent to that address will arrive in your wallet, no matter at what time (days, weeks, months later) that transaction is made.