Reb Yosef Veiner has a fabulous set of Shiurim on Tefilla. It is pretty lengthy and I’m not even sure if he ever finished the series. The first 30 shiurim are available on Kol HaLashon. He starts each shuir with an interesting vertal on the Parsha (of that shuir-they are not labeled by Parsha) and then he goes through various Halachos and Minhagim on Tefilla. After a number of shuirim he switches to going through, almost word-by-word, Shachris. The 30th shuir ends in middle of Pizukei Dizimrah!! That’s how detailed the shuirim are!
But even without the rest of Davening, listening to these shuirim give a whole new meaning to Tefilla! Worth every second! (And Kol HaLashon is FREE!!)
If anyone knows if the Rav ever continued/finished! this series, I would be interested in obtaining the entire set/s.