You can look at a Wait step with Advanced Wait Properties → Must End On = Mon-Fri.
Not sure if this is a great approach, though. What do you gain by making them wait 48 hours to know if their form was posted successfully?
Hi thanks for the response, this will probably do the trick!
You raise a good point, its not the Welcome email but another email that makes more sense with our business process to be delivered on a business day.