Putting the kids on a schedule has helped us tremendously but will have limited efficacy for a toddler. If all else fails, balance screen time for the kid against your use of time off. It's really hard.
If you can find a way to condense your normal workload into 5 hour days it's possible. With no commute, less meetings, and less distractions it's manageable so far for me.
Beyond that being able to get the kids adjusted to a stable new routine is crucial. If they know what to expect everyday you'll hopefully find your time not getting sucked away by meltdowns and behavior issues you weren't expecting.
Also, please don't feel guilty devoting time to your kids right now while "School at Home" is the new normal. Being able to give my kids undivided attention with their education has been a pleasantly positive upside of the current situation. Find ways to enjoy it while you can.
Also, make sure you talk to your direct manager and leadership team, I hope you find that everybody is trying to adjust right now. Not only are many of us trying to juggle the new job of home school parent, there's also the added mental and emotion stress that comes along the with the fact that we're dealing with global pandemic that has upended our normal lives.
I too have been time shifting, but balanced against this is our responsibility to stay somewhat well rested for the sake of health.