Earlier quoted context omitted.
You can send money via Zelle instantly, but I would stick to check or ACH purposes for legal dispute reasons in the case of conducting business, especially paying rent.
Zelle is actually not supposed to be used for anything other than personal payments, despite that rule not being followed by many, many people. My bank told me that Zelle will ban people for it Also, the "instant" limit on Zelle is too low for any reasonable rent in an urban area. It's $1000/day for my bank
https://i.imgur.com/he9PXTn.png
There is a whole FAQ section for using Zelle as a small business: