Hi all
Thanks for the advice just wanted to give people an update
I landed with my American husband into the USA to endorse my ir1. All went smooth. We lined up in the USA passport /resident line. I was a bit worried about boarding since the airline kept prompting me to get an ESTA, but I just ignored it. Eventually the airline saw my visa at check in and used this as evidence of entry into USA, in Australia. So basically all went smooth. I got the IR1 stamp in my visa which acts as a valid green card for a year until I receive my card as the custom officer advised me while stamping my passport and also he read out my mailing address that the green card will be sent to. The customs officer congratulated me on getting my green card (instead of always having to travel on an ESTA this time) and said that I was welcome to travel back and forth and said “here is your green card” and handed me back my passport with a huge welcome smile. The fee I paid before travel was total amount of 235 USCIS fee