Thanks Neil, for the kind words 🙂
You need to use the meta _alg_wc_cog_cost
for your products. The meta _alg_wc_cog_order_cost
is for orders.
After updating the product cost it won’t appear in the analytics automatically. Each order item needs to have a cost too. You can do that manually by visiting each admin order and setting the value yourself or you can use our Tools & Reports > Orders Tools > Recalculate for orders with no costs.
Then, you’ll need to enable the analytics options you want from our Tools & Reports > Analytics section. If our data doesn’t show up there you can try to clear the Analytics cache at WooCommerce > Status > Tools > Clear analytics cache.
Let me know if it helps.