W1P7 Solo Ads Setup sending timing question

Which days / Times are the best for prospects to receive solo ads?, modulated by countries and / or geographical zones?
Can we ask the solo ads sender to send them for an arrival around day X and time Y?
Or at least for sending around day X and time Y?
If necessary, to be more specific, let say for SAS and, if I remember well, for Organifi that john tells us about in one of the video.
Maybe it is not correlated to the product type and so timing is more global days / times.
Shall it be specific to a country or geographic zones, i.e. For U.S.A. (east /west?), for japan, etc . . .?
I know, it is a lot of questions, that may be absolutely irrelevant, but I had to ask.
When we don’t know, we better ask , right?