i had same text you stated above and have got stage 1 result after 17 months , where did you bring it this 1-3 months ? usually after application assigned to a decision-maker you can expect receive the decision in 90 days, this the experienced word with IRCC for three times !Once message changes to we are processing your background check, it means application is assigned to officer and you will have stage 1 decision withtin 1-3 months usually.