Maybe I'm not following here, but if you're capturing in iOS and viewing on PC - so obviously the import and tag has worked, and the note is available - why then do you need to find it again on iOS? And when do you need to use MacOS immediately afterward to view the content?
Each device has to exchange data with the server to update itself - and that is 'almost' immediate these days - but mobile devices use a different network and information loads more slowly, and the more devices you involve, the more exchanges have to be made.
If it's not working to your satisfaction then you could feedback to Evernote that it needs to work faster - but there's no sync button any more, and what you see is pretty much all there is...