That could take a while. It is more dependant on when the ScummVM team decides to issue a new release (a bugfix one or a new major one) because at the end of that release cycle (when the actual release happens on all supported platforms) we upload the release apks to the Play Store (and hopefully Google has not added extra requirements that would disqualify our app update -- which is... a thing they tend to do).
So, for now, only the daily development builds will get the patch. Those are debug builds and *not* compatible with the release builds (so you cannot upgrade between them without losing your configuration (like added games and saved games especially if the later are not saved in external physical space, but rather in the application storage space).
If that's something you can risk/live with, you will be able to test with the development builds (about a day after I commit the fix).