The honest answer for a severe macaw
Yes, a severe macaw can be left during a normal workday, but this is one of the least casual arrangements in companion parrot keeping. Severe macaws are full-sized macaws in temperament even if they are not the largest of the family: intelligent, strong-beaked, socially intense, and quick to announce frustration to the whole street. A bird who gets a quick seed change and a wave goodbye is likely to spend the day screaming, shredding anything reachable, or working on his own feathers. The workday has to be built around him, with real occupation in the cage and real companionship at both ends of it.
Set up occupation, not just entertainment
Before you leave, change his water, offer his morning food in ways that make him work, and rotate in fresh chewable branches, cardboard, and foraging puzzles loaded with pieces of his diet. Scatter part of the food through shredded paper or hide it in folded cups so breakfast becomes a search rather than a two-minute bowl visit. Leave the cage where he can see household activity areas and hear ordinary daytime sound, but out of direct sun and away from kitchen fumes. A radio or television at low volume can soften silence, though it is background, not company, and it should never substitute for interaction later.
Why a midday check matters so much here
For a severe macaw, the middle of the day is when an undisturbed morning puzzle runs out and restlessness starts. A trusted person who can visit, refresh water, hand over a new chew, and spend a few calm minutes talking to him breaks the stretch in a way toys alone cannot. If no visitor is possible on a given day, compensate with a longer morning foraging setup and an earlier, more engaged evening, and watch his behaviour over following days for a pattern. Repeated afternoon screaming, appetite changes, or new feather chewing are information, not naughtiness, and they mean the current arrangement is asking too much of him.
The evening has to repay the day
When you get home, he needs time out of the cage, direct social contact, training games, and a chance to fly or exercise in a safe room. A macaw who knows the evening reliably brings that contact copes far better with daytime solitude than one whose evenings are also rushed. Keep the routine predictable, greet him on arrival, and avoid making your return a frantic burst followed by another long ignoring stretch in front of screens. Weekends should not become all-day handling marathons either, because a sharp contrast makes ordinary Mondays feel even emptier by comparison.
When this setup is not enough
If your work regularly stretches well beyond a normal day, if neighbours report sustained screaming, or if he begins damaging feathers, losing interest in food, or lunging at the cage bars when you leave, treat those as signs to restructure rather than to buy one more toy. More frequent paid or family visits, a later start built around a longer morning session, or honest reconsideration of whether a macaw fits this work pattern may all be needed. A bird showing breathing difficulty, bleeding from a broken feather, or a sudden big behaviour change needs veterinary advice promptly rather than a routine tweak. Keeping the morning setup, the midday visit, and the evening social time as named, timestamped duties in KinsLe Care Teams stops any one of those pieces quietly disappearing on busy weeks.