I became a single mum 6 months ago, but used to do everything myself anyway (except earn the main household income), so didn't change much for me. My children are 18, 16, 14, 3 and 1, but are all coming up for their birthdays during the next 11 weeks. I do appreciate the difference in only having 2 little ones, but really teenagers don't help much at all, like some people think.
Morning routine;
-I get all clothes out the night before and do packed lunches after I get in from work (I work evenings), ready for the morning. Also make sure all school/pre-school bags are packed and already in the car with coats.
-5.45am breastfeed youngest.
-6am wake up any children still asleep, phone set for 6.10am as well, in case I fall back into an exhausted sleep and as a time youngest has to stop feeding, if still on. Toast/crumpets/pancakes, or other low mess breakfast (compared to cereal being thrown everywhere), while I clean my teeth and wash (I never bath first thing in the morning, not enough time).
-Children have teeth cleaned, starting with oldest, who can then make a start with getting dressed, while I clean the little ones teeth. Obviously I'm just talking about the youngest 2 here 
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-Once children are dressed I normally run car if it needs defrosting and rush upstairs to get dressed (luckily I'm in a remote village, so highly unlikely someone would steel my car).
-I often do a drink for myself in a travel mug, for when I get to the bus stop and little ones have a sippy beaker in the car.
-7am leave the house (often feeling frazzled).
-I'm lucky and have 30 minutes after getting home from the first school run, before needing to leave for pre-school, so have this as a backup time if the youngest 2dc didn't have time to get their hair done etc.
Bedtime routine;
-Prepare meal ready to put in the oven at the weekend. I cook in batches and freeze them, then just defrost each meal overnight in the fridge, when needed.
-3.45pm turn oven on to warm up, get little 2 to go to the toilet and get shoes on.
-4pm put tea in the oven and leave for the school bus stop.
-4.45pm arrive home, dish up tea and often come close to a nervous breakdown about how long little 2 are taking to eat.
-5.30pm-5.45pm quick bath for youngest 2 (often regardless of how much/little they have eaten), massage in eczema cream afterwards (find this also helps to relax them), dressed for bed, story, breastfeed (youngest), bed. Normally in bed between 6-6.15pm.
-6.30pm quietly leave for work leaving 1 of my older children to sit in the little 2's room until they are asleep.
-10pm (ish) get home from work and clear up all the mess from tea and bath time, unload and reload dishwasher, put any clothes washing on, do packed lunches, put bags and coats in the car for the morning. Make sure oldest are all in bed and say goodnight. Fall into bed almost asleep already.
It gets easier as they get older, but I find mine don't seem to have any sense of urgency or time.