I thought

A: I thought he would’ve finished painting your new house before you moved into it February last year but he didn’t.
B: I thought he would’ve told you about the party happening tomorrow but he hasn’t.

Are the sentences above correct? How common are these sentences in real life with this kind of sentence structure?

Also, isn’t adding “by now” to sentence B optional?
B: I thought he would’ve told you about the party happening tomorrow (by now) but he hasn’t.