Yes, that is correct. If it is > 100%, there is enough hashing power available to complete the attack, but you could be outbid during the attack. NiceHash has t

Yes, that is correct. If it is > 100%, there is enough hashing power available to complete the attack, but you could be outbid during the attack. NiceHash has the concept of fixed contracts that allow you to lock in a price for up to 24 hours and no one can outbid you. Typically ~30% of the hashing power is available this way.