According to experts you need to start preparing your pets NOW to get them used to you going back to work.
Here are some ways to help
Leave the house more frequency to get them used to being alone. Aim to be out between 30 minutes to an Hour to "desensitize" them.
Try getting up at a regular time, feeding and exercising them at the same time to build the routine back
Make sure they get exercise before you leave for work, if you get them tired they will be ready for a nap
(If Possible) Dropping by on your lunch break can be helpful, or having a friend or neighbour to check in on them
Have you started preparing your pets yet? What have you been doing?