As of writing with 36 hours to go of the auction, the current high bids on both pieces are:

Current high bid for the 1 piece: 1.05 BTC https://scarce.city/auctions/casascius-.5BTC-MS64
Current high bid for the 0.5 piece: 0.55 BTC https://scarce.city/auctions/casascius-1BTC-s2