I like Kagi for the quality of the results, but on a limited plan, I tend to only use Kagi for important things.
Currently, the only way to see the current count is to go to billing, and in details.
Even though, it's not really practical.
It would be handy to have a "progress bar" or even just a counter on the search page (and/or results) simply showing monthly searches (ex: 140/300). That would make me use Kagi more, even for mundane searches.