I could be wrong but on reddit Sanjay said it would be weeks if not months before the caps are released.
Scratch that maybe not months but a month https://www.reddit.com/r/3Dprinting...3d_insulator_to_improve_print_cooling/d2j48uj
Looking forward to the silicone caps and the eSun cleaning filament is fantastic. I can truly see the difference in the way the filament flows thru the nozzle if I forget to use it once I switch from Colorfabb XT back to PLA.