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Need to do more research on this, but my first thought is its possible the portal means to say they are starting to mail out checks on April 24th, and going in order of income.
This is the rough timetable of when they are mailing out checks based on AGI of latest filing. Will try and get clarity to help answer your question better, but for now, find your AGI from this outline and its possible that's when you will receive your check in the mail.
Timeline and Income Levels
April
24th: income up to $10,000
May ($10,001 - $60,000)
1st: 10k - $20k
7th: $20k - $30k
15th: $30k - $40k
22nd: $40k - $50k
29th: $50k - $60k
June ($60,001 - $100,000)
5th: $60k - $70k
12th: $70k - $80k
19th: $80k - $90k
26th: $90k - $100k
July ($100,001 - $150,000)
3rd: $100k - $110k
10th: $110k - $120k
17th: $120k - $130k
24th: $130k - $140k
31st: $140k - $150k
August ($150,001 - $190,000)
7th: $150k - $160k
14th: $160k - $170k
21st: $170k - $180k
28th: $180k - $190k
September
4th: $190,001 - $198,100 (max)