He, “perfected for all time those who are sanctified.” That is the NASB, in this case the NIV and the ESV have a better translation of the Greek, “…those who are being sanctified.”
The word translated perfected is the Greek word that is used for end result, or objective. In some places it is translated mature. The notion here is that as Paul says in Colossians 2:9 – 10 the work is complete. Those in Christ are perfected, completed, and note the duration, for all time or forever.
This is important in the context. The writer of Hebrews has devoted a couple of chapters telling us that we need to rest in what God had done. We are not required to perform the Law. We rest in the fact that He perfected us for all time. We are being sanctified. That means that we our experience is being aligned with the completed work of Christ. But that will not be complete until we are glorified, Romans 8:28 – 31.
That is good news. Spend some time in this book, you will be greatly encouraged.