We applied early February. No RFI. We did not use an agent and front loaded the application. Fingers crossed for you soon. Not sure if it makes any difference at all (seems to be no rhyme or reason to why some get rfi’s and others granted quicker than those who applied earlier) but we have been together 15 years (all of it living in the UK) married for 11 years and have 3 children. And interestingly, he has a year from today (and not the date of his medical back in March) to enter Australia. He also got both visas granted at the same time.