Best Time to Apply for Facebook or Google NYC

For personal reasons, I’m considering relocating to NYC in about a year and would be interested in entry-level SWE roles at Google/Facebook (or company with comparable comp) in the city. I’m under the impression that headcount is limited for L3 roles at these companies in NYC, so what would be the best time to apply to maximize chances of getting an offer? Like my current job and things are going well, so I have flexibility in when I would actually apply.