I am new with Prismic and development. I have created the app on vercel with github hosting
Prismic Blog: https://cricketblog.vercel.app/
After I delete or add new from Prismic Dashboard, it is not getting reflected on live url. Also is there any url generated for Slice Machine in production url i.e. like localhost:9999 on development platform
When you deploy a static website, all the content is generated in the HTML at build time, any updates will need to trigger a rebuild. To do this you'll need to create a webhook to trigger an update in Vercel.
and
Regarding Slice machine, this works as a local development tool, you won't be able to run it on Vercel.