Since Google Play Services are installed with every package, I think it won’t make a huge difference in terms of privacy. Here you can see the differences between all packages.
That’s right. But you wouldn’t have to wait that long if everything goes well:
I can highly recommend LOS with microG with Aurora Store if you want as less google services on your phone as possible but still be able to use apps from Play Store 
My banking apps are all working (even with Magisk) but there might be some banking apps that won’t work, though.
But I (or someone else) could of course check it for you if you consider to install LOS…