Is there any way to trigger a ISR after a SPI transfer is complete?

I am trying to send messages from one of three LORA radios and have the other two read the message. I am using the Radiohead (RF95) Lib with Teensy3.6 and lora featherwings. I can get this to work while in the loop but I would like to be handled in an ISR. I tried to use

attachInterrupt(CS_PIN, loraISR, RISING); 

and this triggers the ISR, but there is not any data to read. I only need to get this data about once a second and I’m kinda stuck... any help would be greatly appreciated!

Would be greatly appreciated!

Thank you, Zack

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