If you are not using third party vector stores, then you can check the number of nodes that you have will be the count of embeddings that you'll have.
nodes= index.docstores.docs
For third party, if you are directly putting data without converting them into nodes using node parser then you'll have to check on the vector stores for the number of embeddings created.
Yes pretty much, Or since you already have the weaviate client object. You can use that to query weaviate DB to find total count. You can check their docs for this.