How to know if the document was synchronized?

What is the best way to know if a document has been synchronized or not?
For example: I created a new document in my mobile application and for some reason has not yet been synchronized (internet error, server error, etc.).
Is there any property or method to see it?
I use Xamarin Android and Couchbase-Lite.Net.

Is this the same question as in this thread?

Yes. Sorry.