The US government is ready to see the 737 MAX re-certified by the end of June — mere weeks from now, as American Airlines CEO Doug Parker predicted. Whether or not that happens may depend on getting some other world agencies to go along. They won’t likely have unanimity, and won’t hold themselves to that standard. But I imagine they’ll hold off until they get Europe and Canada, though not China, to sign off with them.
Once that happens it will take time for airlines to go through steps to bring the plane back into their schedule, which makes cancellations through mid-August taken weeks ago by US carriers seem wise — and suggests that the process to bring the MAX back to the skies is proceeding as expected.