You'll have to forget about watching The Orville's third season on Fox. Hulu has announced that it will offer season 3 of the sci-fi series as an exclusive in the US, with new episodes premiering in late 2020. Creator and star Seth MacFarlane was fairly blunt about the reason for the move: the more ambitious production (particularly special effects, according to Variety) and resulting wait was going to be "challenging" for Fox. This ensures that you can still see The Orville while accommodating its needs.
It's a mixed outcome for MacFarlane and crew. Although it does ensure that you'll see The Orville in some form (the implication was that it might not have survived otherwise), it also shunts the production to an online-only service where the audience might be smaller. In a sense, this is a test of the appeal of online video services. You could soon find out whether fans of a recent hit show will follow it online or stick to conventional TV due to costs or familiarity.