There is a worldwide problem with the supply chain. Brembo make stuff in China like everyone else. Your callipers could be on that ship being held in Egypt.
Can you ask the dealer to loan you one of their demo bikes or second hand bikes for a few weekends of the summer? This is pretty common in the UK dealer network. There's one chap on the UKGSer forum that is in his 3rd month of loan bikes due to waiting for a part for his R1250RS. He has had various bikes to play with, taking new bikes up to 600 miles for the 1st service to take place before they become part of the demo fleet.