Push Notification on the open web

Question

I'd like to know the current status (2020) of implementation of the web standards (Web Push Protocol + VAPID) across major browsers.
Safari is using Apple Push Notification Service and I know that Firefox and recently Chrome implemented it in the full standard way:

• no need to have a gcm_sender_id in the manifest.json
• only need the VAPID public key in the subscription options
• no developer registration to any service

Did Samsung Internet, who used FCM/GCM, passed to the standard way like chrome? What is the status on Opera and Edge?