There's no exact time of extraction of CSVs for a specifc client.
The extraction taskstarts at 09:00 (Moscow time) and scans all clients one by one.
The task starts by looking for any exports that failed the day before and resumes them if any.
The time can vary according to previous errors and load of the day.
If you are interested to know if the file has been extracted, we recommend that you create a routine that would check if the file is there every hour starting from 09:00 (Moscow time).