Those who want to keep your cold storage I will suggest watching this video,
https://www.youtube.com/watch?v=nKBdGI8pu7M you can do this procedure also with Agama while offline if you want an extra layer of security. But for more convenient use do what Yorklab is suggesting and send your balance to your own public address to set the locktime. If you still haven't moved your funds from ledger try using the procedure in the video.
Not much of a difference between previous tutorial and this one, this tutorial suggests resetting Ledger Nano every time one wants to claim interest (it's very inefficient). what i have done is just get private keys and save it in a text file and encrypt it, then decrypt every month and insert private keys in Agama wallet and claim my interests.