Yes it is.
I'm updated to Jan 20 release and I have the fingerprint lock
Change your TWRP to 3.5 and reflash rom
I am not using this phone for banking apps either so I cannot tell from experience. But typically banking apps will attempt to detect root. I use another phone for banking apps. That phone is also A/B so I flash one slot with and one without root. I know at least one app I cannot use on rooted slot (even if I hide root from it in Magisk). If I need that app, I temporarily boot into other non rooted slot, use the app, and, when done, boot back to rooted slot.