Filter on blank and future dates

Summary

Create a filter using SQL expression to show just the null and future dated values

Content

Hello, 

I have a need to see only the null values and future dates. I'm struggling to get the syntax for my SQL expression in the filter. I'm using "Is greater than OR null. See screenshots. Any suggestions? If SQL expression is not the right way to go, I'm open to other options. 

Thanks,

Stephanie