Concerning "Hybrid Cloud with Microsoft Azure", since when can I get the charge details of the previous month?

You can get the charge details of the previous month next month 1st, 9:00 AM JST (0:00 UTC).
However, there is a possibility that the data of the last day of previous month may not be updated at the time.
It depends on the timing when Microsoft updates the data.

(Example) : If you would like to get September's charge details, you can get it after October 1st, 9:00 AM JST.
However, there is a possibility that the data of September 29th and/or 30th's data may not be updated on October 1st.