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To make it really concrete: the following should print the time t at which message msg was recorded followed by the contents for each message received on the topic /robo_explorer/loadcell:

for topic, msg, t in rosbag.Bag('input.bag').read_messages():
    if topic == "/robo_explorer/loadcell":
        print ("{t}: '{msg}'")

To make it really concrete: the following should print the time t at which message msg was recorded followed by the contents for each message received on the topic /robo_explorer/loadcell:

for topic, msg, t in rosbag.Bag('input.bag').read_messages():
    if topic == "/robo_explorer/loadcell":
        print ("{t}: '{msg}'")

To make it really concrete: the following should print the time t at which message msg was recorded followed by the contents for each message received on the topic /robo_explorer/loadcell:

for topic, msg, t in rosbag.Bag('input.bag').read_messages():
    if topic == "/robo_explorer/loadcell":
        print ("{t}: (f"{t}: '{msg}'")

(haven't checked the syntax, so there may be errors)

That would be the best you could do in the absence of a std_msgs/Header field.

And note again: this would get you time at which the message was recorded, not when it was published.