Make Sure the iPad Pro is the Right Size
Do yourself a favor and check out the other iPad models Apple's currently selling.
The company's offers two iPad Pro alternatives: A 9.7-inch iPad and the 7.9-inch iPad mini. Both are extremely capable devices with different screen sizes and different price points.
They aren't as powerful as the iPad Pro (or as the iPad Pro 2018 will be), but you'll want to rule them both out before deciding to wait.
Apple reportedly isn't working on a new iPad mini for 2018.