When I had a sprinkler system, I would (1) optionally water if the soil was already dry, (2) add the fertilizer pellets/etc., (3) optionally add amendments to acidify the soil if it was time as I have alkaline soil, and (4) water again.
With my drip irrigation, I do the same but I schedule my fertilizing before days with a high chance of rain to get the pellets wet. The day before it is supposed to rain, I optionally water if the soil appears to be dry. Afterwards, I spread the fertilizer granules, amendments, etc. that I add to the roses and other plants. Then Mother Nature gives the pellets a soaking the next day.
I use "slow release" fertilizers whenever I can as they last about 3 months per each application. Liquids can also be used but they need to be applied much more frequently, which may not be good due to your injuries. Watch out for some Miracle Gro Liquid formulations that have a lot of nitrogen. If a landscaper installed the drip, do not forget to ask how many minutes of drip equals one gallon of water so you can tweak things accurately. Then write it somewhere where to you can easily find this info again.
Then again, if your soil is not deficient in nutrients/minerals (think: sandy soils), consider just adding mulch and not fertilizing until you are healed. The shrubs will not die. I have left my 100+ roses without ferts in some years with no ill effects. But do continue watering. And tweak the drip frequency and amount of water as needed.
