No you won't miss the boat, There is at least another 10-15 years of fast movement due to retirements. If you get hired at the end of that, your seniority progression will not move as fast. But it will still probably be a good gig.

Starting now, going all in, you could be at a regional in 2-3 years and upgrade 2-3 years later. You'd be competitive for majors within a year after upgrade, or more likely sooner as they run through the available pilot pool.

If you go for flow, that would probably take six years at the regional. So a little longer, but you wouldn't have to sweat applications and interviewing.

If they really get short of pilots, things could move faster.