Hi @Hussein_El-Genk and @Paul_Grobler 
As it stands, it is not possible to change the day for the weekly automatic reminder. It is by default on Friday but I completely understand how useful this option could be for you.
There is an existing thread in the #productfeedback requesting the option to choose the day for the automatic reminder: Status Updates: Need options for "remind me every ___" - #2 by Vince_Mustachio. If you haven’t yet, I would suggest you to upvote it!
On my end I’ll make sure to update the thread as soon as I get any update on the topic!
Have a great Friday! 