Yes, "by" is used to mean, no later than 8. They might arrive a bit earlier.
from: https://hinative.com/en-US/questions/15405462
2021年8月1日 星期日
you look busy 和 you seem busy 的差別在哪裡？
Well, the same when the person is in front of you. It's different when you don't see the person. Text message for example, you seem busy is ok. But you look busy is not because you can't see the other person.
from: https://hinative.com/zh-TW/questions/599496
Let's start 和 Let's get started 的差別在哪裡？
They mean the same thing.
Ex:
"Okay class let's get started."
or
"Okay class let's start."
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