State of the app - when to beta testing?

What I'm developing
ClusterStack (clusterstack.io) is an application which aims to help migrants understand where to go, I'm using machine learning and deep learning to generate predictions and classification to users.

Which features I'll apply using Machine Learning:

• [x] The probability of visa approval by country (V1)
• [ ] The best type of visa application(V2)
• [ ] Link recruiters with users who have a good set of skills to match a job position(V3)
• [ ] Others(V4)

With the machine learning engine, I have enough amount of data today to generate predictions, but it will need more for "fine-tuning". Also with the data, I can provide countries "basic" information for migration.

Which countries are listed:

• [x] Schengen area countries(V1)
• [x] UK and Ireland(V1)
• [ ] US(V2)
• [ ] Canada(V2)
• [ ] Asia(V3)
• [ ] Latin America(V4)

Alright, guys, as my first daily stand-up here, I'll define here what I've achieved so far for V1

1. Machine Learning Engine
2. Back End Engine
3. Stable (with few bugs) IOs version of the app

What is needed to accomplished full V1 of the app:

1. ngix redirect to https
2. Solve image sizing
3. Clear some countries data, the return of the rules
4. Generate a better stable version for Android

I'm still struggling with when to release my app for beta testing using external users, any thoughts?