I would wait for the month to go by, because even though it is possible to Switch to a trail Version. It's bad practice and will result in Errors even though it should not.
If you're willing to suffer the concequences. Go ahead otherwise just complain to get your key faster. When you buy something you shouldn't have to wait a whole month regardless.
I'm not sure with SharePoint 2013, but with 2010 you could use SharePoint foundation and SQL Server Express and use reporting services. If you have a standard SQL and Standard SharePoint this would be possible as well. Best thing, the only investment is your time as you already have licenses for both.
Depending on your dashboarding need, SSRS is a pretty ...