Meshtastic Lora Packet Size

My devices: SX1262
Channel setting:Long Range / Fast
Data-Rate:0.67 kbps
SF / Symbols: 11 / 2048
Coding Rate: 4/8
Bandwidth:250

SX1262 datasheet

This picture is my current understanding of the LoRa and Meshtastic packet structure by using gnuradio.
gr-lora

However, there are still certain parts that I’m unsure about.
I would greatly appreciate it if you could provide me with information regarding the composition of the preamble and how many bytes it occupies? as well as the structure of the LoRa header on this picture correct ?

Thank you very much for your assistance.

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