I am going to reply in English, but feel free to reply in Polish. Polish is not my native language and it is easier to me to write in English, for you it takes a right click to translate it to Polish.
Yes. Multiple users on the forum has these meters.
It depends on the configuration of the meter. Your DSO should provide documentation what the meter transmits and how often. It would make sense if you would provide some information from which DSO your meter is from.
Depending on your setup, how did you read the data from the meter? Is it though an ESPHome device or are you using an RTL-SDR?