Learn Spanish (Spain): Ya llevamos escritos diez episodios. - We have already written ten episodes so far.

This sentence uses the structure llevar + past participle to talk about accumulated progress. Unlike the normal perfect tense with haber (where the participle always ends in -o), the participle used with llevar acts like an adjective. It has to match the gender and number of the object being accumulated. Since episodios is masculine plural, we must use escritos.

What is the difference between saying this and Ya hemos escrito diez episodios?

Both translate to "We have already written ten episodes." However, llevamos escritos strongly emphasizes the progress made so far on an ongoing task. It gives the feeling of a running total, implying that you are still in the process of writing and will likely write more episodes in the future.

Is it okay to change the word order to Ya llevamos diez episodios escritos?

Yes, absolutely! With this structure, you can put the object either before or after the past participle. Both llevamos escritos diez episodios and llevamos diez episodios escritos are perfectly natural and mean the exact same thing.

How does ya fit into this structure?

Ya translates to "already" here. It pairs naturally with the llevar + participle structure to emphasize that you have hit a specific milestone (ten episodes) by this point in time, reinforcing the "so far" meaning.