Bulletproofs are coming soon, but ensuring they are implemented flawlessly will take priority over meeting any particular schedule. You can follow the Monero dev meeting logs for updates here: https://monerobase.com/

Bulletproofs are a replacement for range proofs, and will greatly reduce their size. However, the size reduction will apply only to new transactions that are added to the blockchain, and not to existing transactions.

Your estimate of around 60GB is correct as of September 2018, but of course you will want to ensure more space is available for the blockchain to grow.