There is More Decks Stats and Time Left - AnkiWeb, but would be a nice feature to see “time average” displayed in “reviewer” just like AnkiDroid, with the option to remove it in case of user preference
This add-on is helpful but it’d be nice to see this information displayed in the reviewer as well. I just checked its source code and I guess that this may be achieved by changing the last two lines:
If I understood it correctly, these lines wrap the information generated by the code above it around the stats that are displayed by standard in the deckbrowser. So, maybe it could be modified to display the information in the bottom bar of the reviewer (or somewhere else) instead.