Assuming that ASM keeps its thrice-monthly publication, and that Action continues to come out once a month (not a guarantee, especially lately...), we can do a little quick back-of-the-napkin algebra:
Issue #554 of ASM is the last one published in March; Action didn't publish an issue in March (see what I mean!) though #862 came out in February. So, let x = the number of months until the two titles reach numbering parity, and we get:
554 + 3x = 862 + X
2x = 308
x = 154
So in 154 months; or 12 years, 10 months from now; i.e. January 2020, with issue #1016.
This has been your useless comics math calculation of the day :)