You can use Yoast to manage meta for GeoDirectory listings and insert GeoDirectory custom field data and GeoDirectory variables into Yoast Settings.
Use Yoast with GeoDirectory
Custom Fields
You can use GeoDirectory Custom Fields in the Yoast search appearance settings for the Single page templates.
To render GeoDirectory custom fields the _gd__ prefix is necessary.
Examples: %%_gd__timing%% or %%_gd__website%%
Variables
You can use GeoDirectory variables in Yoast search appearance settings.
GeoDirectory variables, the complete list, can be found in your site on the Titles & Metas settings page.
To render GeoDirectory variable in Yoast meta, add an additional underscore _ prefix for the variable.
Examples: %%_in_location%% or %%_in_location_country%% or %%_gd_category%%
Yoast SEO Global Settings