I don't think it makes sense to add a whole extra page. Instead we could have a toggle that, when enabled, groups all in a new "updates" category that is pinned to the top (only visible when there are updates).

Because in categorised apps section, will have to scan through all the apps or list to find which app has an update.

I agree this is slightly annoying. ImranR98's suggested solution should suffice.

And if I press, Download button it only provide an option which allows user to only update 'all the available', can't select among them at all.

Incorrect, the ability to select which apps to update is already implemented. Long-press the 1st app to enter multi-select mode (from Wiki Apps Page) and then tap on whatever other apps you want to update.

I don't think it makes sense to add a whole extra page. Instead we could have a toggle that, when enabled, groups all in a new "updates" category that is pinned to the top (only visible when there are updates).

Yes, that could work too, It'll be the same, when one doesn't make any category. That will solve it too.
The main point for this whole issue was to ease up the updating process, it doesn't matter how it is done, either be it a page or pinned category.
Cheers.
Thanks for your time and consideration.

Because in categorised apps section, will have to scan through all the apps or list to find which app has an update.

I agree this is slightly annoying. ImranR98's suggested solution should suffice.

And if I press, Download button it only provide an option which allows user to only update 'all the available', can't select among them at all.

Incorrect, the ability to select which apps to update is already implemented. Long-press the 1st app to enter multi-select mode (from Wiki Apps Page) and then tap on whatever other apps you want to update.

First point I agree with.
But with second point I don't, because in that process, still I have to find and choose all the listed apps, it's irritating when one have to watch for like, more than 300+ apps.