When a child is ready to potty train and they are in daycare during the day you can still potty train them at home.
Continue as normal at home over the weekends and take the toddler to the toilet when they need to pee or poop and keep them in pull ups.
At daycare they can be sent in pull ups and then the daycare worker can remind the child to go to the toilet at certain times and take them to the potty.
At home when they come home for the day continue to teach them to potty at home and tell them that when they are at daycare that they should still use the toilet.
Some children may be shy and not want to use the toilet in unfamiliar settings but eventually the child will get it.
I once sent my own 5 year old to daycare and he would not use the toilet at daycare at all so I sent the 5 year old in diapers and told them not to worry about it.
The daycare workers changed his diaper which was okay with me.
The 5 year old would use the toilet at home just fine but not when he was with strangers.
Eventually he would pee in the toilet at daycare once he turned 7 and stopped wearing diapers there.
Most daycare centers will help with the potty training once the parents begin the potty training at home.
However most daycare centers will require the child to wear diapers or pull ups to daycare until they are at least dry for 1 week to 1 month.
The actual rules can vary from daycare to daycare.
At a daycare I used to work at the child had to have wear diapers and not pull ups until they could keep the diaper dry for at least 2 weeks.
If the diaper could be kept dry for at least 2 weeks then they could come in underwear.
If they wet the diaper then they would need to be wear diapers again until a few more weeks passed and they were dry.
Or if the child came in underwear and wet or pooped their underwear a few times in a day then back in diapers they would be.
Daycare centers will not do all the potty training because that is the parents job.
But if they are actively potty training at home the daycare center will help.