I managed to finish all widget related work as well as the tag selection screen used for assigning tags to a task.
With this, most of the features surrounding OmniFocus3 support are in place.
I decided against initial support for custom alarms (notifications) since currently only OmniFocus for iOS supports this feature and I recon people want to get their hands on FocusGTD3 rather sooner than waiting for this feature.
So the overall standing looks like this:
Basically this means I only plan on adding task reordering support and then I will start with in depth testing before the first alpha version will be released.
Dark mode and new UI will probably come as an update.