My advice is to get it in front of others as soon as possible. Even if it's just mock flows, it's fantastic getting feedback and even lining up real customers who are ready to onboard when you first launch.

We've been doing a lot of outreach on social media platforms like Twitter. It's been pretty easy finding people who are part of our target audience, and asking them if they'd be happy jumping on a 15 minute zoom call to help give us some feedback.