If we are changing reported speech irrespective of time, we should keep the following changes in mind,
Today to that day
Tomorrow to the next day
Yesterday to the day before
Now to then
Last week to the week before
If we are changing sentences to reported speech on the same day it was said, then we can keep the mentioned time phrases unchanged.Also you can keep will in first sentence unchanged, if you are saying it in reported speech on the same day it was said.
So, we should change the sentences given by you like the following,
The shoemaker told Mary that her shoes would/will be ready by the next day/tomorrow.(future tense to present conditional)
Andrew asked Ali whether he had gone to the cinema the previous day/yesterday.
In the third sentence, you should use "posted" instead of "post" as the sentence is in past tense.
- The postman told Adams that the letter had posted ten days ago (past tense to past perfect).