Debian has already been patched, so if your Raspbian Jessie and Stretch systems are up to date they have the fixes in place. Also, if you are not even using the WiFi connection, then WiFi on or off on your Pi should not matter.
Now your router is another subject. Your router will need the fix or pretty much anything on your network using a wireless connection puts your entire network at risk. So if you are paranoid, then turn off WiFi on your router until you can confirm a firmware fix. Router makers were first notified in July, so some have fixed the issue, while others have not but are still working on it (and some may never fix it, especially for older models).
My mind is like a browser. 27 tabs are open, 9 aren't responding,
lots of pop-ups...and where is that annoying music coming from?