Here are the links you'll need for Maria Lenk:
Finals will start every evening at 7PM Local time, which is 6PM East Coast US Time. (Bucking their tradition, Brazil will swim finals of this meet in the evening).
And a last note – the Brazilians are thinking that an all-time, textile best could go down in the 50 fly in this meet from Cielo, based on how he's been swimming. That time currently stands at 22.98 from last year (by Cielo).