Fun stuff!

Congrats on that first egg!
My gold sex link, Red, has always laid jumbo eggs.
I think her first two could be considered extra large.
For several months I would actually weigh their eggs on a digital weight watchers scale and record it on the calendar.
Her first egg was 1.8 ounces layed at 20 weeks.
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After 4 days she began laying 2 ounce eggs and at one week laid a double yolker at 2.8 ounces.
Here’s that one compared to her normal egg:
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At two weeks, she laid another double yolker that was 3.1 ounces.
After laying for two months she laid a wopper that was 3.7 ounces!

Double yolker.
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Same egg in the carton with another of Red’s eggs and my SLW eggs:
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The Wyandottes started laying at 6 months old within days of each other.
Their eggs started out at 1.4 - 1.6 ounces and after several months evened out at 1.8 - 2.2 ounces on average.
Red averages a 2.6 ounce egg now.