I seem to owe these days, so I do file on time now.
However, when I use to get refunds, I never filed my taxes on time.
I even filed three years worth taxes at once after I received a bunch of letters from the IRS.
They just sent me my refunds, and that was the end of it.
It sounds like you will probably get money back, so there will be no penalties. I think your stressing over nothing. Get your taxes done and see where you stand.