A new version 3.0.0-beta.3 of vue-meteor-tracker is out on NPM to support Vue 3:
https://github.com/meteor-vue/vue-meteor-tracker
It is a full rewrite with TypeScript, Composition (and Options) API support. The Options API is very similar to the Vue 2 version (minus some removed APIs such as $startMeteor/$stopMeteor).
Together with vite:bundler, support of Vue 3 is nearly complete.