The PDF online is same as what you will receive in mail but with the official logo/paper. Read it, if it is approved, it is approved. Probably, once they completed the mailing, your status will change, something like forwarded to State (NVC). Congrats!
For your peace of mind, I look at my history:
I-130 Approval. pdf Nov 9, 2021
Case History:
We are actively reviewing your Form I-130, Petition for Alien Relative. Our records showed nothing is outstanding at this time. (Nov 9)
Your case for your Form I-130, Petition for Alien Relative was approved. (Nov 10)
Case Was Sent To The Department of State (Nov 13).