You are correct and for the time being, the NativeScript Companion app does not support NS 3.0.0 applications. To update the Companion app, we need to make NativeScript 3.0.0 the default version in the Platform. Additionally, before we can make NS 3.0.0 the default version, we need to test it extensively and ensure that the newly introduced breaking changes are not causing issues.
Having said that, unfortunately, we do not have a specific date for when this functionality will be available. Currently, we plan to introduce support for NS 3.0.0 in the Companion app in August. Please, have in mind that this time frame is preliminary and can be changed.
I hope this is of any help.
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