When in doubt, ask for the QC (Quality Control) spec sheet from your client. Never assume "safe" means the same thing to everyone. If they can't provide a spec, use 85% for text and 90% for action —it's the safest compromise for modern flat-panel TVs.
At the bottom: and Title Safe percentages. safe margins in premiere pro
Sequence > Sequence Settings (or right-click sequence > Sequence Settings) > Video tab. When in doubt, ask for the QC (Quality