Ozone8 still a HUGE CPU hog but if you plan the sessions out beforehand you can have the bounced tracks and automations etc already in audio format so when you are ready to master the stems are already done and that way I don't see an issue using O8 on HD10
Of course this is just my thoughts and not in any way the end all option but well worth doing on any computer spec as it just makes everything flow nicely.
We do these steps with the bounced stems even though the record companies pay for professional mastering suites so we haven't mastered ourselves ever. Takes way more knowledge than buying a "mastering plugin" and the learning curve to master for big artists songs that goes on radio worldwide and charts takes many many years and IMHO should be done by the pro's in their field
