A job doesn't mean he gets to duck out of parenting completely. What time will he be leaving?
Toddlers are usually very early risers anyway which worked well for us!!
My husband used to get the toddler dressed and give him his breakfast - or at least lay out the clothes and pack a little bag for him with spare clothes / snacks etc so that he was pretty much ready for the day before he left.
Then CBeebies for however long it takes you to get baby and you sorted.
Get prepped night before, lay out clothes, have everything baby needs in a basket in your room so after he first feed you can get them ready for the day. Pack the changing bag!
The toddler was also very good at 'entertaining' the baby if she was in her bouncer chair, she used to love watching her big brother jumping / singing etc whilst I got on with stuff.
Then go out.
As much as possible.
Research all the cheap tots groups eg church based playgroups, toy libraries, breastfeeding groups etc etc and maybe one or two paid for eg music / soft play sessions. Even just a walk maybe collecting 'treasure' in a Tupperware box or a scavenger hunt for eg red postbox, blue car, magpie etc
I built up a really good routine every week which kept us out of the house so house stayed relatively ok and toddler as always knackered for a decent afternoon nap.
A sling for baby was a godsend as could just strap her on and crack on with the toddler eg playing on the floor at playgroup, making lunch, dancing / singing along at music monkeys etc
Once I got into the swing of it, I loved that bit of parenting as it's fucking hard work but the sense of achievement at the end of each day with 2 small people still intact was amazing!
You'll be fine 